python init fails

[sinewalker]

The python init attempts to install some python modules using pip, but into the global context.

• do I actually want to do things this way? If so which is better, pip or the OS's package system?
• Perhaps I don't want to init anything beyond virtualenv (and maybe virtualenv wrapper used by eshell-prompt-extras)?

[sinewalker]

updated the issue title: it fails in OS X also!

Sourcing 50_python.sh
Requirement already up-to-date: pip in /usr/local/lib/python2.7/site-packages
Collecting setuptools
  Using cached setuptools-34.2.0-py2.py3-none-any.whl
Requirement already up-to-date: wheel in /usr/local/lib/python2.7/site-packages
Requirement already up-to-date: virtualenv in /usr/local/lib/python2.7/site-packages
Requirement already up-to-date: six>=1.6.0 in /usr/local/lib/python2.7/site-packages (from setuptools)
Requirement already up-to-date: packaging>=16.8 in /usr/local/lib/python2.7/site-packages (from setuptools)
Requirement already up-to-date: appdirs>=1.4.0 in /usr/local/lib/python2.7/site-packages (from setuptools)
Requirement already up-to-date: pyparsing in /usr/local/lib/python2.7/site-packages (from packaging>=16.8->setuptools)
Installing collected packages: setuptools
  Found existing installation: setuptools 34.1.1
    Uninstalling setuptools-34.1.1:
Exception:
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/site-packages/pip/basecommand.py", line 215, in main
    status = self.run(options, args)
  File "/usr/local/lib/python2.7/site-packages/pip/commands/install.py", line 342, in run
    prefix=options.prefix_path,
  File "/usr/local/lib/python2.7/site-packages/pip/req/req_set.py", line 778, in install
    requirement.uninstall(auto_confirm=True)
  File "/usr/local/lib/python2.7/site-packages/pip/req/req_install.py", line 754, in uninstall
    paths_to_remove.remove(auto_confirm)
  File "/usr/local/lib/python2.7/site-packages/pip/req/req_uninstall.py", line 115, in remove
    renames(path, new_path)
  File "/usr/local/lib/python2.7/site-packages/pip/utils/__init__.py", line 267, in renames
    shutil.move(old, new)
  File "/usr/local/Cellar/python/2.7.13/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 303, in move
    os.unlink(src)
OSError: [Errno 13] Permission denied: '/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py'
Collecting Mercurial
  Downloading mercurial-4.1.tar.gz (5.1MB)
    100% |████████████████████████████████| 5.1MB 240kB/s
Requirement already up-to-date: hg-git in /usr/local/lib/python2.7/site-packages
Requirement already up-to-date: dulwich>=0.9.7 in /usr/local/lib/python2.7/site-packages (from hg-git)
Building wheels for collected packages: Mercurial
  Running setup.py bdist_wheel for Mercurial ... done
  Stored in directory: /Users/mjl/Library/Caches/pip/wheels/c6/f7/d8/6a898cb6d46366a9eb51d0220b573cfc7d1ddc98d2cb2830ce
Successfully built Mercurial
Installing collected packages: Mercurial
  Found existing installation: mercurial 4.0.2
    DEPRECATION: Uninstalling a distutils installed project (Mercurial) has been deprecated and will be removed in a future version. This is due to the fact that uninstalling a distutils project will only partially uninstall the project.
    Uninstalling mercurial-4.0.2:
      Successfully uninstalled mercurial-4.0.2
  Rolling back uninstall of mercurial
Exception:
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/site-packages/pip/basecommand.py", line 215, in main
    status = self.run(options, args)
  File "/usr/local/lib/python2.7/site-packages/pip/commands/install.py", line 342, in run
    prefix=options.prefix_path,
  File "/usr/local/lib/python2.7/site-packages/pip/req/req_set.py", line 784, in install
    **kwargs
  File "/usr/local/lib/python2.7/site-packages/pip/req/req_install.py", line 851, in install
    self.move_wheel_files(self.source_dir, root=root, prefix=prefix)
  File "/usr/local/lib/python2.7/site-packages/pip/req/req_install.py", line 1064, in move_wheel_files
    isolated=self.isolated,
  File "/usr/local/lib/python2.7/site-packages/pip/wheel.py", line 345, in move_wheel_files
    clobber(source, lib_dir, True)
  File "/usr/local/lib/python2.7/site-packages/pip/wheel.py", line 323, in clobber
    shutil.copyfile(srcfile, destfile)
  File "/usr/local/Cellar/python/2.7.13/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 83, in copyfile
    with open(dst, 'wb') as fdst:
IOError: [Errno 13] Permission denied: '/usr/local/lib/python2.7/site-packages/hgext/__init__.py'
Requirement already up-to-date: isort in /usr/local/lib/python2.7/site-packages
Collecting ipython
  Downloading ipython-5.2.2-py2-none-any.whl (749kB)
    100% |████████████████████████████████| 757kB 1.2MB/s
Requirement already up-to-date: traitlets>=4.2 in /usr/local/lib/python2.7/site-packages (from ipython)
Requirement already up-to-date: decorator in /usr/local/lib/python2.7/site-packages (from ipython)
Requirement already up-to-date: simplegeneric>0.8 in /usr/local/lib/python2.7/site-packages (from ipython)
Requirement already up-to-date: backports.shutil-get-terminal-size; python_version == "2.7" in /usr/local/lib/python2.7/site-packages (from ipython)
Requirement already up-to-date: pygments in /usr/local/lib/python2.7/site-packages (from ipython)
Requirement already up-to-date: appnope; sys_platform == "darwin" in /usr/local/lib/python2.7/site-packages (from ipython)
Requirement already up-to-date: pexpect; sys_platform != "win32" in /usr/local/lib/python2.7/site-packages (from ipython)
Requirement already up-to-date: pickleshare in /usr/local/lib/python2.7/site-packages (from ipython)
Collecting prompt-toolkit<2.0.0,>=1.0.4 (from ipython)
  Downloading prompt_toolkit-1.0.13-py2-none-any.whl (247kB)
    100% |████████████████████████████████| 256kB 3.2MB/s
Collecting setuptools>=18.5 (from ipython)
  Using cached setuptools-34.2.0-py2.py3-none-any.whl
Requirement already up-to-date: pathlib2; python_version == "2.7" or python_version == "3.3" in /usr/local/lib/python2.7/site-packages (from ipython)
Requirement already up-to-date: ipython-genutils in /usr/local/lib/python2.7/site-packages (from traitlets>=4.2->ipython)
Requirement already up-to-date: six in /usr/local/lib/python2.7/site-packages (from traitlets>=4.2->ipython)
Requirement already up-to-date: enum34; python_version == "2.7" in /usr/local/lib/python2.7/site-packages (from traitlets>=4.2->ipython)
Requirement already up-to-date: ptyprocess>=0.5 in /usr/local/lib/python2.7/site-packages (from pexpect; sys_platform != "win32"->ipython)
Requirement already up-to-date: wcwidth in /usr/local/lib/python2.7/site-packages (from prompt-toolkit<2.0.0,>=1.0.4->ipython)
Requirement already up-to-date: packaging>=16.8 in /usr/local/lib/python2.7/site-packages (from setuptools>=18.5->ipython)
Requirement already up-to-date: appdirs>=1.4.0 in /usr/local/lib/python2.7/site-packages (from setuptools>=18.5->ipython)
Requirement already up-to-date: scandir; python_version < "3.5" in /usr/local/lib/python2.7/site-packages (from pathlib2; python_version == "2.7" or python_version == "3.3"->ipython)
Requirement already up-to-date: pyparsing in /usr/local/lib/python2.7/site-packages (from packaging>=16.8->setuptools>=18.5->ipython)
Installing collected packages: prompt-toolkit, setuptools, ipython
  Found existing installation: prompt-toolkit 1.0.10
    Uninstalling prompt-toolkit-1.0.10:
      Successfully uninstalled prompt-toolkit-1.0.10
  Found existing installation: setuptools 34.1.1
    Uninstalling setuptools-34.1.1:
Exception:
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/site-packages/pip/basecommand.py", line 215, in main
    status = self.run(options, args)
  File "/usr/local/lib/python2.7/site-packages/pip/commands/install.py", line 342, in run
    prefix=options.prefix_path,
  File "/usr/local/lib/python2.7/site-packages/pip/req/req_set.py", line 778, in install
    requirement.uninstall(auto_confirm=True)
  File "/usr/local/lib/python2.7/site-packages/pip/req/req_install.py", line 754, in uninstall
    paths_to_remove.remove(auto_confirm)
  File "/usr/local/lib/python2.7/site-packages/pip/req/req_uninstall.py", line 115, in remove
    renames(path, new_path)
  File "/usr/local/lib/python2.7/site-packages/pip/utils/__init__.py", line 267, in renames
    shutil.move(old, new)
  File "/usr/local/Cellar/python/2.7.13/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 303, in move
    os.unlink(src)
OSError: [Errno 13] Permission denied: '/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py'