Changelog
### 19.0.3
```
===================
Bug Fixes
---------
- Fix an ``IndexError`` crash when a legacy build of a wheel fails. (`6252 <https://github.com/pypa/pip/issues/6252>`_)
- Fix a regression introduced in 19.0.2 where the filename in a RECORD file
of an installed file would not be updated when installing a wheel. (`6266 <https://github.com/pypa/pip/issues/6266>`_)
```
### 19.0.2
```
===================
Bug Fixes
---------
- Fix a crash where PEP 517-based builds using ``--no-cache-dir`` would fail in
some circumstances with an ``AssertionError`` due to not finalizing a build
directory internally. (`6197 <https://github.com/pypa/pip/issues/6197>`_)
- Provide a better error message if attempting an editable install of a
directory with a ``pyproject.toml`` but no ``setup.py``. (`6170 <https://github.com/pypa/pip/issues/6170>`_)
- The implicit default backend used for projects that provide a ``pyproject.toml``
file without explicitly specifying ``build-backend`` now behaves more like direct
execution of ``setup.py``, and hence should restore compatibility with projects
that were unable to be installed with ``pip`` 19.0. This raised the minimum
required version of ``setuptools`` for such builds to 40.8.0. (`6163 <https://github.com/pypa/pip/issues/6163>`_)
- Allow ``RECORD`` lines with more than three elements, and display a warning. (`6165 <https://github.com/pypa/pip/issues/6165>`_)
- ``AdjacentTempDirectory`` fails on unwritable directory instead of locking up the uninstall command. (`6169 <https://github.com/pypa/pip/issues/6169>`_)
- Make failed uninstalls roll back more reliably and better at avoiding naming conflicts. (`6194 <https://github.com/pypa/pip/issues/6194>`_)
- Ensure the correct wheel file is copied when building PEP 517 distribution is built. (`6196 <https://github.com/pypa/pip/issues/6196>`_)
- The Python 2 end of life warning now only shows on CPython, which is the
implementation that has announced end of life plans. (`6207 <https://github.com/pypa/pip/issues/6207>`_)
Improved Documentation
----------------------
- Re-write README and documentation index (`5815 <https://github.com/pypa/pip/issues/5815>`_)
```
### 19.0.1
```
===================
Bug Fixes
---------
- Fix a crash when using --no-cache-dir with PEP 517 distributions (`6158 <https://github.com/pypa/pip/issues/6158>`_, `6171 <https://github.com/pypa/pip/issues/6171>`_)
```
### 19.0
```
=================
Deprecations and Removals
-------------------------
- Deprecate support for Python 3.4 (`6106 <https://github.com/pypa/pip/issues/6106>`_)
- Start printing a warning for Python 2.7 to warn of impending Python 2.7 End-of-life and
prompt users to start migrating to Python 3. (`6148 <https://github.com/pypa/pip/issues/6148>`_)
- Remove the deprecated ``--process-dependency-links`` option. (`6060 <https://github.com/pypa/pip/issues/6060>`_)
- Remove the deprecated SVN editable detection based on dependency links
during freeze. (`5866 <https://github.com/pypa/pip/issues/5866>`_)
Features
--------
- Implement PEP 517 (allow projects to specify a build backend via pyproject.toml). (`5743 <https://github.com/pypa/pip/issues/5743>`_)
- Implement manylinux2010 platform tag support. manylinux2010 is the successor
to manylinux1. It allows carefully compiled binary wheels to be installed
on compatible Linux platforms. (`5008 <https://github.com/pypa/pip/issues/5008>`_)
- Improve build isolation: handle ``.pth`` files, so namespace packages are correctly supported under Python 3.2 and earlier. (`5656 <https://github.com/pypa/pip/issues/5656>`_)
- Include the package name in a freeze warning if the package is not installed. (`5943 <https://github.com/pypa/pip/issues/5943>`_)
- Warn when dropping an ``--[extra-]index-url`` value that points to an existing local directory. (`5827 <https://github.com/pypa/pip/issues/5827>`_)
- Prefix pip's ``--log`` file lines with their timestamp. (`6141 <https://github.com/pypa/pip/issues/6141>`_)
Bug Fixes
---------
- Avoid creating excessively long temporary paths when uninstalling packages. (`3055 <https://github.com/pypa/pip/issues/3055>`_)
- Redact the password from the URL in various log messages. (`4746 <https://github.com/pypa/pip/issues/4746>`_, `6124 <https://github.com/pypa/pip/issues/6124>`_)
- Avoid creating excessively long temporary paths when uninstalling packages. (`3055 <https://github.com/pypa/pip/issues/3055>`_)
- Avoid printing a stack trace when given an invalid requirement. (`5147 <https://github.com/pypa/pip/issues/5147>`_)
- Present 401 warning if username/password do not work for URL (`4833 <https://github.com/pypa/pip/issues/4833>`_)
- Handle ``requests.exceptions.RetryError`` raised in ``PackageFinder`` that was causing pip to fail silently when some indexes were unreachable. (`5270 <https://github.com/pypa/pip/issues/5270>`_, `5483 <https://github.com/pypa/pip/issues/5483>`_)
- Handle a broken stdout pipe more gracefully (e.g. when running ``pip list | head``). (`4170 <https://github.com/pypa/pip/issues/4170>`_)
- Fix crash from setting ``PIP_NO_CACHE_DIR=yes``. (`5385 <https://github.com/pypa/pip/issues/5385>`_)
- Fix crash from unparseable requirements when checking installed packages. (`5839 <https://github.com/pypa/pip/issues/5839>`_)
- Fix content type detection if a directory named like an archive is used as a package source. (`5838 <https://github.com/pypa/pip/issues/5838>`_)
- Fix listing of outdated packages that are not dependencies of installed packages in ``pip list --outdated --not-required`` (`5737 <https://github.com/pypa/pip/issues/5737>`_)
- Fix sorting ``TypeError`` in ``move_wheel_files()`` when installing some packages. (`5868 <https://github.com/pypa/pip/issues/5868>`_)
- Fix support for invoking pip using ``python src/pip ...``. (`5841 <https://github.com/pypa/pip/issues/5841>`_)
- Greatly reduce memory usage when installing wheels containing large files. (`5848 <https://github.com/pypa/pip/issues/5848>`_)
- Editable non-VCS installs now freeze as editable. (`5031 <https://github.com/pypa/pip/issues/5031>`_)
- Editable Git installs without a remote now freeze as editable. (`4759 <https://github.com/pypa/pip/issues/4759>`_)
- Canonicalize sdist file names so they can be matched to a canonicalized package name passed to ``pip install``. (`5870 <https://github.com/pypa/pip/issues/5870>`_)
- Properly decode special characters in SVN URL credentials. (`5968 <https://github.com/pypa/pip/issues/5968>`_)
- Make ``PIP_NO_CACHE_DIR`` disable the cache also for truthy values like ``"true"``, ``"yes"``, ``"1"``, etc. (`5735 <https://github.com/pypa/pip/issues/5735>`_)
Vendored Libraries
------------------
- Include license text of vendored 3rd party libraries. (`5213 <https://github.com/pypa/pip/issues/5213>`_)
- Update certifi to 2018.11.29
- Update colorama to 0.4.1
- Update distlib to 0.2.8
- Update idna to 2.8
- Update packaging to 19.0
- Update pep517 to 0.5.0
- Update pkg_resources to 40.6.3 (via setuptools)
- Update pyparsing to 2.3.1
- Update pytoml to 0.1.20
- Update requests to 2.21.0
- Update six to 1.12.0
- Update urllib3 to 1.24.1
Improved Documentation
----------------------
- Include the Vendoring Policy in the documentation. (`5958 <https://github.com/pypa/pip/issues/5958>`_)
- Add instructions for running pip from source to Development documentation. (`5949 <https://github.com/pypa/pip/issues/5949>`_)
- Remove references to removed ``egg=<name>-<version>`` functionality (`5888 <https://github.com/pypa/pip/issues/5888>`_)
- Fix omission of command name in HTML usage documentation (`5984 <https://github.com/pypa/pip/issues/5984>`_)
```
### 18.1
```
=================
Features
--------
- Allow PEP 508 URL requirements to be used as dependencies.
As a security measure, pip will raise an exception when installing packages from
PyPI if those packages depend on packages not also hosted on PyPI.
In the future, PyPI will block uploading packages with such external URL dependencies directly. (`4187 <https://github.com/pypa/pip/issues/4187>`_)
- Allows dist options (--abi, --python-version, --platform, --implementation) when installing with --target (`5355 <https://github.com/pypa/pip/issues/5355>`_)
- Support passing ``svn+ssh`` URLs with a username to ``pip install -e``. (`5375 <https://github.com/pypa/pip/issues/5375>`_)
- pip now ensures that the RECORD file is sorted when installing from a wheel file. (`5525 <https://github.com/pypa/pip/issues/5525>`_)
- Add support for Python 3.7. (`5561 <https://github.com/pypa/pip/issues/5561>`_)
- Malformed configuration files now show helpful error messages, instead of tracebacks. (`5798 <https://github.com/pypa/pip/issues/5798>`_)
Bug Fixes
---------
- Checkout the correct branch when doing an editable Git install. (`2037 <https://github.com/pypa/pip/issues/2037>`_)
- Run self-version-check only on commands that may access the index, instead of
trying on every run and failing to do so due to missing options. (`5433 <https://github.com/pypa/pip/issues/5433>`_)
- Allow a Git ref to be installed over an existing installation. (`5624 <https://github.com/pypa/pip/issues/5624>`_)
- Show a better error message when a configuration option has an invalid value. (`5644 <https://github.com/pypa/pip/issues/5644>`_)
- Always revalidate cached simple API pages instead of blindly caching them for up to 10
minutes. (`5670 <https://github.com/pypa/pip/issues/5670>`_)
- Avoid caching self-version-check information when cache is disabled. (`5679 <https://github.com/pypa/pip/issues/5679>`_)
- Avoid traceback printing on autocomplete after flags in the CLI. (`5751 <https://github.com/pypa/pip/issues/5751>`_)
- Fix incorrect parsing of egg names if pip needs to guess the package name. (`5819 <https://github.com/pypa/pip/issues/5819>`_)
Vendored Libraries
------------------
- Upgrade certifi to 2018.8.24
- Upgrade packaging to 18.0
- Upgrade pyparsing to 2.2.1
- Add pep517 version 0.2
- Upgrade pytoml to 0.1.19
- Upgrade pkg_resources to 40.4.3 (via setuptools)
Improved Documentation
----------------------
- Fix "Requirements Files" reference in User Guide (`user_guide_fix_requirements_file_ref <https://github.com/pypa/pip/issues/user_guide_fix_requirements_file_ref>`_)
```
### 18.0
```
=================
Process
-------
- Switch to a Calendar based versioning scheme.
- Formally document our deprecation process as a minimum of 6 months of deprecation
warnings.
- Adopt and document NEWS fragment writing style.
- Switch to releasing a new, non-bug fix version of pip every 3 months.
Deprecations and Removals
-------------------------
- Remove the legacy format from pip list. (3651, 3654)
- Dropped support for Python 3.3. (3796)
- Remove support for cleaning up egg fragment postfixes. (4174)
- Remove the shim for the old get-pip.py location. (5520)
For the past 2 years, it's only been redirecting users to use the newer
https://bootstrap.pypa.io/get-pip.py location.
Features
--------
- Introduce a new --prefer-binary flag, to prefer older wheels over newer source packages. (3785)
- Improve autocompletion function on file name completion after options
which have ``<file>``, ``<dir>`` or ``<path>`` as metavar. (4842, 5125)
- Add support for installing PEP 518 build dependencies from source. (5229)
- Improve status message when upgrade is skipped due to only-if-needed strategy. (5319)
Bug Fixes
---------
- Update pip's self-check logic to not use a virtualenv specific file and honor cache-dir. (3905)
- Remove compiled pyo files for wheel packages. (4471)
- Speed up printing of newly installed package versions. (5127)
- Restrict install time dependency warnings to directly-dependant packages. (5196, 5457)
Warning about the entire package set has resulted in users getting confused as
to why pip is printing these warnings.
- Improve handling of PEP 518 build requirements: support environment markers and extras. (5230, 5265)
- Remove username/password from log message when using index with basic auth. (5249)
- Remove trailing os.sep from PATH directories to avoid false negatives. (5293)
- Fix "pip wheel pip" being blocked by the "don't use pip to modify itself" check. (5311, 5312)
- Disable pip's version check (and upgrade message) when installed by a different package manager. (5346)
This works better with Linux distributions where pip's upgrade message may
result in users running pip in a manner that modifies files that should be
managed by the OS's package manager.
- Check for file existence and unlink first when clobbering existing files during a wheel install. (5366)
- Improve error message to be more specific when no files are found as listed in as listed in PKG-INFO. (5381)
- Always read ``pyproject.toml`` as UTF-8. This fixes Unicode handling on Windows and Python 2. (5482)
- Fix a crash that occurs when PATH not set, while generating script location warning. (5558)
- Disallow packages with ``pyproject.toml`` files that have an empty build-system table. (5627)
Vendored Libraries
------------------
- Update CacheControl to 0.12.5.
- Update certifi to 2018.4.16.
- Update distro to 1.3.0.
- Update idna to 2.7.
- Update ipaddress to 1.0.22.
- Update pkg_resources to 39.2.0 (via setuptools).
- Update progress to 1.4.
- Update pytoml to 0.1.16.
- Update requests to 2.19.1.
- Update urllib3 to 1.23.
Improved Documentation
----------------------
- Document how to use pip with a proxy server. (512, 5574)
- Document that the output of pip show is in RFC-compliant mail header format. (5261)
```
### 10.0.1
```
===================
Features
--------
- Switch the default repository to the new "PyPI 2.0" running at
https://pypi.org/. (5214)
Bug Fixes
---------
- Fix a bug that made get-pip.py unusable on Windows without renaming. (5219)
- Fix a TypeError when loading the cache on older versions of Python 2.7.
(5231)
- Fix and improve error message when EnvironmentError occurs during
installation. (5237)
- A crash when reinstalling from VCS requirements has been fixed. (5251)
- Fix PEP 518 support when pip is installed in the user site. (5524)
Vendored Libraries
------------------
- Upgrade distlib to 0.2.7
```
### 10.0.0
```
===================
Bug Fixes
---------
- Prevent false-positive installation warnings due to incomplete name
normalization. (5134)
- Fix issue where installing from Git with a short SHA would fail. (5140)
- Accept pre-release versions when checking for conflicts with pip check or pip
install. (5141)
- ``ioctl(fd, termios.TIOCGWINSZ, ...)`` needs 8 bytes of data (5150)
- Do not warn about script location when installing to the directory containing
sys.executable. This is the case when 'pip install'ing without activating a
virtualenv. (5157)
- Fix PEP 518 support. (5188)
- Don't warn about script locations if ``--target`` is specified. (5203)
```
### 10.0.0b2
```
=====================
Bug Fixes
---------
- Fixed line endings in CA Bundle - 10.0.0b1 was inadvertently released with Windows
line endings. (5131)
```
### 10.0.0b1
```
=====================
Deprecations and Removals
-------------------------
- Removed the deprecated ``--egg`` parameter to ``pip install``. (1749)
- Removed support for uninstalling projects which have been installed using
distutils. distutils installed projects do not include metadata indicating
what files belong to that install and thus it is impossible to *actually*
uninstall them rather than just remove the metadata saying they've been
installed while leaving all of the actual files behind. (2386)
- Removed the deprecated ``--download`` option to ``pip install``. (2643)
- Removed the deprecated --(no-)use-wheel flags to ``pip install`` and ``pip
wheel``. (2699)
- Removed the deprecated ``--allow-external``, ``--allow-all-external``, and
``--allow-unverified`` options. (3070)
- Switch the default for ``pip list`` to the columns format, and deprecate the
legacy format. (3654, 3686)
- Deprecate support for Python 3.3. (3796)
- Removed the deprecated ``--default-vcs`` option. (4052)
- Removed the ``setup.py test`` support from our sdist as it wasn't being
maintained as a supported means to run our tests. (4203)
- Dropped support for Python 2.6. (4343)
- Removed the --editable flag from pip download, as it did not make sense
(4362)
- Deprecate SVN detection based on dependency links in ``pip freeze``. (4449)
- Move all of pip's APIs into the pip._internal package, properly reflecting
the fact that pip does not currently have any public APIs. (4696, 4700)
Features
--------
- Add `--progress-bar <progress_bar>` to ``pip download``, ``pip install`` and
``pip wheel`` commands, to allow selecting a specific progress indicator or,
to completely suppress, (for example in a CI environment) use
``--progress-bar off. (2369, 2756)
- Add `--no-color` to `pip`. All colored output is disabled if this flag is
detected. (2449)
- pip uninstall now ignores the absence of a requirement and prints a warning.
(3016, 4642)
- Improved the memory and disk efficiency of the HTTP cache. (3515)
- Support for packages specifying build dependencies in pyproject.toml (see
`PEP 518 <https://www.python.org/dev/peps/pep-0518/>`__). Packages which
specify one or more build dependencies this way will be built into wheels in
an isolated environment with those dependencies installed. (3691)
- pip now supports environment variable expansion in requirement files using
only ``${VARIABLE}`` syntax on all platforms. (3728)
- Allowed combinations of -q and -v to act sanely. Then we don't need warnings
mentioned in the issue. (4008)
- Add `--exclude-editable` to ``pip freeze`` and ``pip list`` to exclude
editable packages from installed package list. (4015, 4016)
- Improve the error message for the common ``pip install ./requirements.txt``
case. (4127)
- Add support for the new `` url`` syntax from PEP 508. (4175)
- Add setuptools version to the statistics sent to BigQuery. (4209)
- Report the line which caused the hash error when using requirement files.
(4227)
- Add a pip config command for managing configuration files. (4240)
- Allow ``pip download`` to be used with a specific platform when ``--no-deps``
is set. (4289)
- Support build-numbers in wheel versions and support sorting with
build-numbers. (4299)
- Change pip outdated to use PackageFinder in order to do the version lookup so
that local mirrors in Environments that do not have Internet connections can
be used as the Source of Truth for latest version. (4336)
- pip now retries on more HTTP status codes, for intermittent failures.
Previously, it only retried on the standard 503. Now, it also retries on 500
(transient failures on AWS S3), 520 and 527 (transient failures on
Cloudflare). (4473)
- pip now displays where it is looking for packages, if non-default locations
are used. (4483)
- Display a message to run the right command for modifying pip on Windows
(4490)
- Add Man Pages for pip (4491)
- Make uninstall command less verbose by default (4493)
- Switch the default upgrade strategy to be 'only-if-needed' (4500)
- Installing from a local directory or a VCS URL now builds a wheel to install,
rather than running ``setup.py install``. Wheels from these sources are not
cached. (4501)
- Don't log a warning when installing a dependency from Git if the name looks
like a commit hash. (4507)
- pip now displays a warning when it installs scripts from a wheel outside the
PATH. These warnings can be suppressed using a new --no-warn-script-location
option. (4553)
- Local Packages can now be referenced using forward slashes on Windows.
(4563)
- pip show learnt a new Required-by field that lists currently installed
packages that depend on the shown package (4564)
- The command-line autocompletion engine ``pip show`` now autocompletes
installed distribution names. (4749)
- Change documentation theme to be in line with Python Documentation (4758)
- Add auto completion of short options. (4954)
- Run 'setup.py develop' inside pep518 build environment. (4999)
- pip install now prints an error message when it installs an incompatible
version of a dependency. (5000)
- Added a way to distinguish between pip installed packages and those from the
system package manager in 'pip list'. Specifically, 'pip list -v' also shows
the installer of package if it has that meta data. (949)
- Show install locations when list command ran with "-v" option. (979)
Bug Fixes
---------
- Allow pip to work if the ``GIT_DIR`` and ``GIT_WORK_TREE`` environment
variables are set. (1130)
- Make ``pip install --force-reinstall`` not require passing ``--upgrade``.
(1139)
- Return a failing exit status when `pip install`, `pip download`, or `pip
wheel` is called with no requirements. (2720)
- Interactive setup.py files will no longer hang indefinitely. (2732, 4982)
- Correctly reset the terminal if an exception occurs while a progress bar is
being shown. (3015)
- "Support URL-encoded characters in URL credentials." (3236)
- Don't assume sys.__stderr__.encoding exists (3356)
- Fix ``pip uninstall`` when ``easy-install.pth`` lacks a trailing newline.
(3741)
- Keep install options in requirements.txt from leaking. (3763)
- pip no longer passes global options from one package to later packages in the
same requirement file. (3830)
- Support installing from Git refs (3876)
- Use pkg_resources to parse the entry points file to allow names with colons.
(3901)
- ``-q`` specified once correctly sets logging level to WARNING, instead of
CRITICAL. Use `-qqq` to have the previous behavior back. (3994)
- Shell completion scripts now use correct executable names (e.g., ``pip3``
instead of ``pip``) (3997)
- Changed vendored encodings from ``utf8`` to ``utf-8``. (4076)
- Fixes destination directory of data_files when ``pip install --target`` is
used. (4092)
- Limit the disabling of requests' pyopenssl to Windows only. Fixes
"SNIMissingWarning / InsecurePlatformWarning not fixable with pip 9.0 /
9.0.1" (for non-Windows) (4098)
- Support the installation of wheels with non-PEP 440 version in their
filenames. (4169)
- Fall back to sys.getdefaultencoding() if locale.getpreferredencoding()
returns None in `pip.utils.encoding.auto_decode`. (4184)
- Fix a bug where `SETUPTOOLS_SHIM` got called incorrectly for relative path
requirements by converting relative paths to absolute paths prior to calling
the shim. (4208)
- Return the latest version number in search results. (4219)
- Improve error message on permission errors (4233)
- Fail gracefully when ``/etc/image_version`` (or another distro version file)
appears to exists but is not readable. (4249)
- Avoid importing setuptools in the parent pip process, to avoid a race
condition when upgrading one of setuptools dependencies. (4264)
- Fix for an incorrect ``freeze`` warning message due to a package being
included in multiple requirements files that were passed to ``freeze``.
Instead of warning incorrectly that the package is not installed, pip now
warns that the package was declared multiple times and lists the name of each
requirements file that contains the package in question. (4293)
- Generalize help text for ``compile``/``no-compile`` flags. (4316)
- Handle the case when ``/etc`` is not readable by the current user by using a
hardcoded list of possible names of release files. (4320)
- Fixed a ``NameError`` when attempting to catch ``FileNotFoundError`` on
Python 2.7. (4322)
- Ensure USER_SITE is correctly initialised. (4437)
- Reinstalling an editable package from Git no longer assumes that the
``master`` branch exists. (4448)
- This fixes an issue where when someone who tries to use git with pip but pip
can't because git is not in the path environment variable. This clarifies the
error given to suggest to the user what might be wrong. (4461)
- Improve handling of text output from build tools (avoid Unicode errors)
(4486)
- Fix a "No such file or directory" error when using --prefix. (4495)
- Allow commands to opt out of --require-venv. This allows pip help to work
even when the environment variable PIP_REQUIRE_VIRTUALENV is set. (4496)
- Fix warning message on mismatched versions during installation. (4655)
- pip now records installed files in a deterministic manner improving
reproducibility. (4667)
- Fix an issue where ``pip install -e`` on a Git url would fail to update if a
branch or tag name is specified that happens to match the prefix of the
current ``HEAD`` commit hash. (4675)
- Fix an issue where a variable assigned in a try clause was accessed in the
except clause, resulting in an undefined variable error in the except clause.
(4811)
- Use log level `info` instead of `warning` when ignoring packages due to
environment markers. (4876)
- Replaced typo mistake in subversion support. (4908)
- Terminal size is now correctly inferred when using Python 3 on Windows.
(4966)
- Abort if reading configuration causes encoding errors. (4976)
- Add a ``--no-user`` option and use it when installing build dependencies.
(5085)
Vendored Libraries
------------------
- Upgraded appdirs to 1.4.3.
- Upgraded CacheControl to 0.12.3.
- Vendored certifi at 2017.7.27.1.
- Vendored chardet at 3.0.4.
- Upgraded colorama to 0.3.9.
- Upgraded distlib to 0.2.6.
- Upgraded distro to 1.2.0.
- Vendored idna at idna==2.6.
- Upgraded ipaddress to 1.0.18.
- Vendored msgpack-python at 0.4.8.
- Removed the vendored ordereddict.
- Upgraded progress to 1.3.
- Upgraded pyparsing to 2.2.0.
- Upgraded pytoml to 0.1.14.
- Upgraded requests to 2.18.4.
- Upgraded pkg_resources (via setuptools) to 36.6.0.
- Upgraded six to 1.11.0.
- Vendored urllib3 at 1.22.
- Upgraded webencodings to 0.5.1.
Improved Documentation
----------------------
- Added documentation on usage of --build command line option (4262)
- (4358)
- Document how to call pip from your code, including the fact that we do not
provide a Python API. (4743)
```
### 9.0.3
```
==================
- Fix an error where the vendored requests was not correctly containing itself
to only the internal vendored prefix.
- Restore compatibility with 2.6.
```
### 9.0.2
```
==================
- Fallback to using SecureTransport on macOS when the linked OpenSSL is too old
to support TLSv1.2.
```
Links
- PyPI: https://pypi.org/project/pip
- Changelog: https://pyup.io/changelogs/pip/
- Homepage: https://pip.pypa.io/
pyup-bot
commented
5 years ago
This PR updates pip from 9.0.1 to 19.0.3.
Changelog
### 19.0.3 ``` =================== Bug Fixes --------- - Fix an ``IndexError`` crash when a legacy build of a wheel fails. (`6252 <https://github.com/pypa/pip/issues/6252>`_) - Fix a regression introduced in 19.0.2 where the filename in a RECORD file of an installed file would not be updated when installing a wheel. (`6266 <https://github.com/pypa/pip/issues/6266>`_) ``` ### 19.0.2 ``` =================== Bug Fixes --------- - Fix a crash where PEP 517-based builds using ``--no-cache-dir`` would fail in some circumstances with an ``AssertionError`` due to not finalizing a build directory internally. (`6197 <https://github.com/pypa/pip/issues/6197>`_) - Provide a better error message if attempting an editable install of a directory with a ``pyproject.toml`` but no ``setup.py``. (`6170 <https://github.com/pypa/pip/issues/6170>`_) - The implicit default backend used for projects that provide a ``pyproject.toml`` file without explicitly specifying ``build-backend`` now behaves more like direct execution of ``setup.py``, and hence should restore compatibility with projects that were unable to be installed with ``pip`` 19.0. This raised the minimum required version of ``setuptools`` for such builds to 40.8.0. (`6163 <https://github.com/pypa/pip/issues/6163>`_) - Allow ``RECORD`` lines with more than three elements, and display a warning. (`6165 <https://github.com/pypa/pip/issues/6165>`_) - ``AdjacentTempDirectory`` fails on unwritable directory instead of locking up the uninstall command. (`6169 <https://github.com/pypa/pip/issues/6169>`_) - Make failed uninstalls roll back more reliably and better at avoiding naming conflicts. (`6194 <https://github.com/pypa/pip/issues/6194>`_) - Ensure the correct wheel file is copied when building PEP 517 distribution is built. (`6196 <https://github.com/pypa/pip/issues/6196>`_) - The Python 2 end of life warning now only shows on CPython, which is the implementation that has announced end of life plans. (`6207 <https://github.com/pypa/pip/issues/6207>`_) Improved Documentation ---------------------- - Re-write README and documentation index (`5815 <https://github.com/pypa/pip/issues/5815>`_) ``` ### 19.0.1 ``` =================== Bug Fixes --------- - Fix a crash when using --no-cache-dir with PEP 517 distributions (`6158 <https://github.com/pypa/pip/issues/6158>`_, `6171 <https://github.com/pypa/pip/issues/6171>`_) ``` ### 19.0 ``` ================= Deprecations and Removals ------------------------- - Deprecate support for Python 3.4 (`6106 <https://github.com/pypa/pip/issues/6106>`_) - Start printing a warning for Python 2.7 to warn of impending Python 2.7 End-of-life and prompt users to start migrating to Python 3. (`6148 <https://github.com/pypa/pip/issues/6148>`_) - Remove the deprecated ``--process-dependency-links`` option. (`6060 <https://github.com/pypa/pip/issues/6060>`_) - Remove the deprecated SVN editable detection based on dependency links during freeze. (`5866 <https://github.com/pypa/pip/issues/5866>`_) Features -------- - Implement PEP 517 (allow projects to specify a build backend via pyproject.toml). (`5743 <https://github.com/pypa/pip/issues/5743>`_) - Implement manylinux2010 platform tag support. manylinux2010 is the successor to manylinux1. It allows carefully compiled binary wheels to be installed on compatible Linux platforms. (`5008 <https://github.com/pypa/pip/issues/5008>`_) - Improve build isolation: handle ``.pth`` files, so namespace packages are correctly supported under Python 3.2 and earlier. (`5656 <https://github.com/pypa/pip/issues/5656>`_) - Include the package name in a freeze warning if the package is not installed. (`5943 <https://github.com/pypa/pip/issues/5943>`_) - Warn when dropping an ``--[extra-]index-url`` value that points to an existing local directory. (`5827 <https://github.com/pypa/pip/issues/5827>`_) - Prefix pip's ``--log`` file lines with their timestamp. (`6141 <https://github.com/pypa/pip/issues/6141>`_) Bug Fixes --------- - Avoid creating excessively long temporary paths when uninstalling packages. (`3055 <https://github.com/pypa/pip/issues/3055>`_) - Redact the password from the URL in various log messages. (`4746 <https://github.com/pypa/pip/issues/4746>`_, `6124 <https://github.com/pypa/pip/issues/6124>`_) - Avoid creating excessively long temporary paths when uninstalling packages. (`3055 <https://github.com/pypa/pip/issues/3055>`_) - Avoid printing a stack trace when given an invalid requirement. (`5147 <https://github.com/pypa/pip/issues/5147>`_) - Present 401 warning if username/password do not work for URL (`4833 <https://github.com/pypa/pip/issues/4833>`_) - Handle ``requests.exceptions.RetryError`` raised in ``PackageFinder`` that was causing pip to fail silently when some indexes were unreachable. (`5270 <https://github.com/pypa/pip/issues/5270>`_, `5483 <https://github.com/pypa/pip/issues/5483>`_) - Handle a broken stdout pipe more gracefully (e.g. when running ``pip list | head``). (`4170 <https://github.com/pypa/pip/issues/4170>`_) - Fix crash from setting ``PIP_NO_CACHE_DIR=yes``. (`5385 <https://github.com/pypa/pip/issues/5385>`_) - Fix crash from unparseable requirements when checking installed packages. (`5839 <https://github.com/pypa/pip/issues/5839>`_) - Fix content type detection if a directory named like an archive is used as a package source. (`5838 <https://github.com/pypa/pip/issues/5838>`_) - Fix listing of outdated packages that are not dependencies of installed packages in ``pip list --outdated --not-required`` (`5737 <https://github.com/pypa/pip/issues/5737>`_) - Fix sorting ``TypeError`` in ``move_wheel_files()`` when installing some packages. (`5868 <https://github.com/pypa/pip/issues/5868>`_) - Fix support for invoking pip using ``python src/pip ...``. (`5841 <https://github.com/pypa/pip/issues/5841>`_) - Greatly reduce memory usage when installing wheels containing large files. (`5848 <https://github.com/pypa/pip/issues/5848>`_) - Editable non-VCS installs now freeze as editable. (`5031 <https://github.com/pypa/pip/issues/5031>`_) - Editable Git installs without a remote now freeze as editable. (`4759 <https://github.com/pypa/pip/issues/4759>`_) - Canonicalize sdist file names so they can be matched to a canonicalized package name passed to ``pip install``. (`5870 <https://github.com/pypa/pip/issues/5870>`_) - Properly decode special characters in SVN URL credentials. (`5968 <https://github.com/pypa/pip/issues/5968>`_) - Make ``PIP_NO_CACHE_DIR`` disable the cache also for truthy values like ``"true"``, ``"yes"``, ``"1"``, etc. (`5735 <https://github.com/pypa/pip/issues/5735>`_) Vendored Libraries ------------------ - Include license text of vendored 3rd party libraries. (`5213 <https://github.com/pypa/pip/issues/5213>`_) - Update certifi to 2018.11.29 - Update colorama to 0.4.1 - Update distlib to 0.2.8 - Update idna to 2.8 - Update packaging to 19.0 - Update pep517 to 0.5.0 - Update pkg_resources to 40.6.3 (via setuptools) - Update pyparsing to 2.3.1 - Update pytoml to 0.1.20 - Update requests to 2.21.0 - Update six to 1.12.0 - Update urllib3 to 1.24.1 Improved Documentation ---------------------- - Include the Vendoring Policy in the documentation. (`5958 <https://github.com/pypa/pip/issues/5958>`_) - Add instructions for running pip from source to Development documentation. (`5949 <https://github.com/pypa/pip/issues/5949>`_) - Remove references to removed ``egg=<name>-<version>`` functionality (`5888 <https://github.com/pypa/pip/issues/5888>`_) - Fix omission of command name in HTML usage documentation (`5984 <https://github.com/pypa/pip/issues/5984>`_) ``` ### 18.1 ``` ================= Features -------- - Allow PEP 508 URL requirements to be used as dependencies. As a security measure, pip will raise an exception when installing packages from PyPI if those packages depend on packages not also hosted on PyPI. In the future, PyPI will block uploading packages with such external URL dependencies directly. (`4187 <https://github.com/pypa/pip/issues/4187>`_) - Allows dist options (--abi, --python-version, --platform, --implementation) when installing with --target (`5355 <https://github.com/pypa/pip/issues/5355>`_) - Support passing ``svn+ssh`` URLs with a username to ``pip install -e``. (`5375 <https://github.com/pypa/pip/issues/5375>`_) - pip now ensures that the RECORD file is sorted when installing from a wheel file. (`5525 <https://github.com/pypa/pip/issues/5525>`_) - Add support for Python 3.7. (`5561 <https://github.com/pypa/pip/issues/5561>`_) - Malformed configuration files now show helpful error messages, instead of tracebacks. (`5798 <https://github.com/pypa/pip/issues/5798>`_) Bug Fixes --------- - Checkout the correct branch when doing an editable Git install. (`2037 <https://github.com/pypa/pip/issues/2037>`_) - Run self-version-check only on commands that may access the index, instead of trying on every run and failing to do so due to missing options. (`5433 <https://github.com/pypa/pip/issues/5433>`_) - Allow a Git ref to be installed over an existing installation. (`5624 <https://github.com/pypa/pip/issues/5624>`_) - Show a better error message when a configuration option has an invalid value. (`5644 <https://github.com/pypa/pip/issues/5644>`_) - Always revalidate cached simple API pages instead of blindly caching them for up to 10 minutes. (`5670 <https://github.com/pypa/pip/issues/5670>`_) - Avoid caching self-version-check information when cache is disabled. (`5679 <https://github.com/pypa/pip/issues/5679>`_) - Avoid traceback printing on autocomplete after flags in the CLI. (`5751 <https://github.com/pypa/pip/issues/5751>`_) - Fix incorrect parsing of egg names if pip needs to guess the package name. (`5819 <https://github.com/pypa/pip/issues/5819>`_) Vendored Libraries ------------------ - Upgrade certifi to 2018.8.24 - Upgrade packaging to 18.0 - Upgrade pyparsing to 2.2.1 - Add pep517 version 0.2 - Upgrade pytoml to 0.1.19 - Upgrade pkg_resources to 40.4.3 (via setuptools) Improved Documentation ---------------------- - Fix "Requirements Files" reference in User Guide (`user_guide_fix_requirements_file_ref <https://github.com/pypa/pip/issues/user_guide_fix_requirements_file_ref>`_) ``` ### 18.0 ``` ================= Process ------- - Switch to a Calendar based versioning scheme. - Formally document our deprecation process as a minimum of 6 months of deprecation warnings. - Adopt and document NEWS fragment writing style. - Switch to releasing a new, non-bug fix version of pip every 3 months. Deprecations and Removals ------------------------- - Remove the legacy format from pip list. (3651, 3654) - Dropped support for Python 3.3. (3796) - Remove support for cleaning up egg fragment postfixes. (4174) - Remove the shim for the old get-pip.py location. (5520) For the past 2 years, it's only been redirecting users to use the newer https://bootstrap.pypa.io/get-pip.py location. Features -------- - Introduce a new --prefer-binary flag, to prefer older wheels over newer source packages. (3785) - Improve autocompletion function on file name completion after options which have ``<file>``, ``<dir>`` or ``<path>`` as metavar. (4842, 5125) - Add support for installing PEP 518 build dependencies from source. (5229) - Improve status message when upgrade is skipped due to only-if-needed strategy. (5319) Bug Fixes --------- - Update pip's self-check logic to not use a virtualenv specific file and honor cache-dir. (3905) - Remove compiled pyo files for wheel packages. (4471) - Speed up printing of newly installed package versions. (5127) - Restrict install time dependency warnings to directly-dependant packages. (5196, 5457) Warning about the entire package set has resulted in users getting confused as to why pip is printing these warnings. - Improve handling of PEP 518 build requirements: support environment markers and extras. (5230, 5265) - Remove username/password from log message when using index with basic auth. (5249) - Remove trailing os.sep from PATH directories to avoid false negatives. (5293) - Fix "pip wheel pip" being blocked by the "don't use pip to modify itself" check. (5311, 5312) - Disable pip's version check (and upgrade message) when installed by a different package manager. (5346) This works better with Linux distributions where pip's upgrade message may result in users running pip in a manner that modifies files that should be managed by the OS's package manager. - Check for file existence and unlink first when clobbering existing files during a wheel install. (5366) - Improve error message to be more specific when no files are found as listed in as listed in PKG-INFO. (5381) - Always read ``pyproject.toml`` as UTF-8. This fixes Unicode handling on Windows and Python 2. (5482) - Fix a crash that occurs when PATH not set, while generating script location warning. (5558) - Disallow packages with ``pyproject.toml`` files that have an empty build-system table. (5627) Vendored Libraries ------------------ - Update CacheControl to 0.12.5. - Update certifi to 2018.4.16. - Update distro to 1.3.0. - Update idna to 2.7. - Update ipaddress to 1.0.22. - Update pkg_resources to 39.2.0 (via setuptools). - Update progress to 1.4. - Update pytoml to 0.1.16. - Update requests to 2.19.1. - Update urllib3 to 1.23. Improved Documentation ---------------------- - Document how to use pip with a proxy server. (512, 5574) - Document that the output of pip show is in RFC-compliant mail header format. (5261) ``` ### 10.0.1 ``` =================== Features -------- - Switch the default repository to the new "PyPI 2.0" running at https://pypi.org/. (5214) Bug Fixes --------- - Fix a bug that made get-pip.py unusable on Windows without renaming. (5219) - Fix a TypeError when loading the cache on older versions of Python 2.7. (5231) - Fix and improve error message when EnvironmentError occurs during installation. (5237) - A crash when reinstalling from VCS requirements has been fixed. (5251) - Fix PEP 518 support when pip is installed in the user site. (5524) Vendored Libraries ------------------ - Upgrade distlib to 0.2.7 ``` ### 10.0.0 ``` =================== Bug Fixes --------- - Prevent false-positive installation warnings due to incomplete name normalization. (5134) - Fix issue where installing from Git with a short SHA would fail. (5140) - Accept pre-release versions when checking for conflicts with pip check or pip install. (5141) - ``ioctl(fd, termios.TIOCGWINSZ, ...)`` needs 8 bytes of data (5150) - Do not warn about script location when installing to the directory containing sys.executable. This is the case when 'pip install'ing without activating a virtualenv. (5157) - Fix PEP 518 support. (5188) - Don't warn about script locations if ``--target`` is specified. (5203) ``` ### 10.0.0b2 ``` ===================== Bug Fixes --------- - Fixed line endings in CA Bundle - 10.0.0b1 was inadvertently released with Windows line endings. (5131) ``` ### 10.0.0b1 ``` ===================== Deprecations and Removals ------------------------- - Removed the deprecated ``--egg`` parameter to ``pip install``. (1749) - Removed support for uninstalling projects which have been installed using distutils. distutils installed projects do not include metadata indicating what files belong to that install and thus it is impossible to *actually* uninstall them rather than just remove the metadata saying they've been installed while leaving all of the actual files behind. (2386) - Removed the deprecated ``--download`` option to ``pip install``. (2643) - Removed the deprecated --(no-)use-wheel flags to ``pip install`` and ``pip wheel``. (2699) - Removed the deprecated ``--allow-external``, ``--allow-all-external``, and ``--allow-unverified`` options. (3070) - Switch the default for ``pip list`` to the columns format, and deprecate the legacy format. (3654, 3686) - Deprecate support for Python 3.3. (3796) - Removed the deprecated ``--default-vcs`` option. (4052) - Removed the ``setup.py test`` support from our sdist as it wasn't being maintained as a supported means to run our tests. (4203) - Dropped support for Python 2.6. (4343) - Removed the --editable flag from pip download, as it did not make sense (4362) - Deprecate SVN detection based on dependency links in ``pip freeze``. (4449) - Move all of pip's APIs into the pip._internal package, properly reflecting the fact that pip does not currently have any public APIs. (4696, 4700) Features -------- - Add `--progress-bar <progress_bar>` to ``pip download``, ``pip install`` and ``pip wheel`` commands, to allow selecting a specific progress indicator or, to completely suppress, (for example in a CI environment) use ``--progress-bar off. (2369, 2756) - Add `--no-color` to `pip`. All colored output is disabled if this flag is detected. (2449) - pip uninstall now ignores the absence of a requirement and prints a warning. (3016, 4642) - Improved the memory and disk efficiency of the HTTP cache. (3515) - Support for packages specifying build dependencies in pyproject.toml (see `PEP 518 <https://www.python.org/dev/peps/pep-0518/>`__). Packages which specify one or more build dependencies this way will be built into wheels in an isolated environment with those dependencies installed. (3691) - pip now supports environment variable expansion in requirement files using only ``${VARIABLE}`` syntax on all platforms. (3728) - Allowed combinations of -q and -v to act sanely. Then we don't need warnings mentioned in the issue. (4008) - Add `--exclude-editable` to ``pip freeze`` and ``pip list`` to exclude editable packages from installed package list. (4015, 4016) - Improve the error message for the common ``pip install ./requirements.txt`` case. (4127) - Add support for the new `` url`` syntax from PEP 508. (4175) - Add setuptools version to the statistics sent to BigQuery. (4209) - Report the line which caused the hash error when using requirement files. (4227) - Add a pip config command for managing configuration files. (4240) - Allow ``pip download`` to be used with a specific platform when ``--no-deps`` is set. (4289) - Support build-numbers in wheel versions and support sorting with build-numbers. (4299) - Change pip outdated to use PackageFinder in order to do the version lookup so that local mirrors in Environments that do not have Internet connections can be used as the Source of Truth for latest version. (4336) - pip now retries on more HTTP status codes, for intermittent failures. Previously, it only retried on the standard 503. Now, it also retries on 500 (transient failures on AWS S3), 520 and 527 (transient failures on Cloudflare). (4473) - pip now displays where it is looking for packages, if non-default locations are used. (4483) - Display a message to run the right command for modifying pip on Windows (4490) - Add Man Pages for pip (4491) - Make uninstall command less verbose by default (4493) - Switch the default upgrade strategy to be 'only-if-needed' (4500) - Installing from a local directory or a VCS URL now builds a wheel to install, rather than running ``setup.py install``. Wheels from these sources are not cached. (4501) - Don't log a warning when installing a dependency from Git if the name looks like a commit hash. (4507) - pip now displays a warning when it installs scripts from a wheel outside the PATH. These warnings can be suppressed using a new --no-warn-script-location option. (4553) - Local Packages can now be referenced using forward slashes on Windows. (4563) - pip show learnt a new Required-by field that lists currently installed packages that depend on the shown package (4564) - The command-line autocompletion engine ``pip show`` now autocompletes installed distribution names. (4749) - Change documentation theme to be in line with Python Documentation (4758) - Add auto completion of short options. (4954) - Run 'setup.py develop' inside pep518 build environment. (4999) - pip install now prints an error message when it installs an incompatible version of a dependency. (5000) - Added a way to distinguish between pip installed packages and those from the system package manager in 'pip list'. Specifically, 'pip list -v' also shows the installer of package if it has that meta data. (949) - Show install locations when list command ran with "-v" option. (979) Bug Fixes --------- - Allow pip to work if the ``GIT_DIR`` and ``GIT_WORK_TREE`` environment variables are set. (1130) - Make ``pip install --force-reinstall`` not require passing ``--upgrade``. (1139) - Return a failing exit status when `pip install`, `pip download`, or `pip wheel` is called with no requirements. (2720) - Interactive setup.py files will no longer hang indefinitely. (2732, 4982) - Correctly reset the terminal if an exception occurs while a progress bar is being shown. (3015) - "Support URL-encoded characters in URL credentials." (3236) - Don't assume sys.__stderr__.encoding exists (3356) - Fix ``pip uninstall`` when ``easy-install.pth`` lacks a trailing newline. (3741) - Keep install options in requirements.txt from leaking. (3763) - pip no longer passes global options from one package to later packages in the same requirement file. (3830) - Support installing from Git refs (3876) - Use pkg_resources to parse the entry points file to allow names with colons. (3901) - ``-q`` specified once correctly sets logging level to WARNING, instead of CRITICAL. Use `-qqq` to have the previous behavior back. (3994) - Shell completion scripts now use correct executable names (e.g., ``pip3`` instead of ``pip``) (3997) - Changed vendored encodings from ``utf8`` to ``utf-8``. (4076) - Fixes destination directory of data_files when ``pip install --target`` is used. (4092) - Limit the disabling of requests' pyopenssl to Windows only. Fixes "SNIMissingWarning / InsecurePlatformWarning not fixable with pip 9.0 / 9.0.1" (for non-Windows) (4098) - Support the installation of wheels with non-PEP 440 version in their filenames. (4169) - Fall back to sys.getdefaultencoding() if locale.getpreferredencoding() returns None in `pip.utils.encoding.auto_decode`. (4184) - Fix a bug where `SETUPTOOLS_SHIM` got called incorrectly for relative path requirements by converting relative paths to absolute paths prior to calling the shim. (4208) - Return the latest version number in search results. (4219) - Improve error message on permission errors (4233) - Fail gracefully when ``/etc/image_version`` (or another distro version file) appears to exists but is not readable. (4249) - Avoid importing setuptools in the parent pip process, to avoid a race condition when upgrading one of setuptools dependencies. (4264) - Fix for an incorrect ``freeze`` warning message due to a package being included in multiple requirements files that were passed to ``freeze``. Instead of warning incorrectly that the package is not installed, pip now warns that the package was declared multiple times and lists the name of each requirements file that contains the package in question. (4293) - Generalize help text for ``compile``/``no-compile`` flags. (4316) - Handle the case when ``/etc`` is not readable by the current user by using a hardcoded list of possible names of release files. (4320) - Fixed a ``NameError`` when attempting to catch ``FileNotFoundError`` on Python 2.7. (4322) - Ensure USER_SITE is correctly initialised. (4437) - Reinstalling an editable package from Git no longer assumes that the ``master`` branch exists. (4448) - This fixes an issue where when someone who tries to use git with pip but pip can't because git is not in the path environment variable. This clarifies the error given to suggest to the user what might be wrong. (4461) - Improve handling of text output from build tools (avoid Unicode errors) (4486) - Fix a "No such file or directory" error when using --prefix. (4495) - Allow commands to opt out of --require-venv. This allows pip help to work even when the environment variable PIP_REQUIRE_VIRTUALENV is set. (4496) - Fix warning message on mismatched versions during installation. (4655) - pip now records installed files in a deterministic manner improving reproducibility. (4667) - Fix an issue where ``pip install -e`` on a Git url would fail to update if a branch or tag name is specified that happens to match the prefix of the current ``HEAD`` commit hash. (4675) - Fix an issue where a variable assigned in a try clause was accessed in the except clause, resulting in an undefined variable error in the except clause. (4811) - Use log level `info` instead of `warning` when ignoring packages due to environment markers. (4876) - Replaced typo mistake in subversion support. (4908) - Terminal size is now correctly inferred when using Python 3 on Windows. (4966) - Abort if reading configuration causes encoding errors. (4976) - Add a ``--no-user`` option and use it when installing build dependencies. (5085) Vendored Libraries ------------------ - Upgraded appdirs to 1.4.3. - Upgraded CacheControl to 0.12.3. - Vendored certifi at 2017.7.27.1. - Vendored chardet at 3.0.4. - Upgraded colorama to 0.3.9. - Upgraded distlib to 0.2.6. - Upgraded distro to 1.2.0. - Vendored idna at idna==2.6. - Upgraded ipaddress to 1.0.18. - Vendored msgpack-python at 0.4.8. - Removed the vendored ordereddict. - Upgraded progress to 1.3. - Upgraded pyparsing to 2.2.0. - Upgraded pytoml to 0.1.14. - Upgraded requests to 2.18.4. - Upgraded pkg_resources (via setuptools) to 36.6.0. - Upgraded six to 1.11.0. - Vendored urllib3 at 1.22. - Upgraded webencodings to 0.5.1. Improved Documentation ---------------------- - Added documentation on usage of --build command line option (4262) - (4358) - Document how to call pip from your code, including the fact that we do not provide a Python API. (4743) ``` ### 9.0.3 ``` ================== - Fix an error where the vendored requests was not correctly containing itself to only the internal vendored prefix. - Restore compatibility with 2.6. ``` ### 9.0.2 ``` ================== - Fallback to using SecureTransport on macOS when the linked OpenSSL is too old to support TLSv1.2. ```Links
- PyPI: https://pypi.org/project/pip - Changelog: https://pyup.io/changelogs/pip/ - Homepage: https://pip.pypa.io/