Requirements have an unclear dependency on build tools

[derrick-anderson]

Bug Description Project installation dependencies requirements.txt file has listed a dependency on the build library of psycopg2

When installing the project dependencies users are presented with the following error:

Collecting psycopg2==2.8.6
  Using cached psycopg2-2.8.6.tar.gz (383 kB)
    ERROR: Command errored out with exit status 1:
     command: /home/danderson/workspace/thenewboston-python/venv/bin/python3 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-57z5h7ls/psycopg2/setup.py'"'"'; __file__='"'"'/tmp/pip-install-57z5h7ls/psycopg2/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-install-57z5h7ls/psycopg2/pip-egg-info
         cwd: /tmp/pip-install-57z5h7ls/psycopg2/
    Complete output (23 lines):
    running egg_info
    creating /tmp/pip-install-57z5h7ls/psycopg2/pip-egg-info/psycopg2.egg-info
    writing /tmp/pip-install-57z5h7ls/psycopg2/pip-egg-info/psycopg2.egg-info/PKG-INFO
    writing dependency_links to /tmp/pip-install-57z5h7ls/psycopg2/pip-egg-info/psycopg2.egg-info/dependency_links.txt
    writing top-level names to /tmp/pip-install-57z5h7ls/psycopg2/pip-egg-info/psycopg2.egg-info/top_level.txt
    writing manifest file '/tmp/pip-install-57z5h7ls/psycopg2/pip-egg-info/psycopg2.egg-info/SOURCES.txt'

    Error: pg_config executable not found.

    pg_config is required to build psycopg2 from source.  Please add the directory
    containing pg_config to the $PATH or specify the full executable path with the
    option:

        python setup.py build_ext --pg-config /path/to/pg_config build ...

    or with the pg_config option in 'setup.cfg'.

    If you prefer to avoid building psycopg2 from source, please install the PyPI
    'psycopg2-binary' package instead.

    For further information please check the 'doc/src/install.rst' file (also at
    <https://www.psycopg.org/docs/install.html>).

    ----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

Steps to Reproduce Steps to reproduce the behavior:

1. Clone Project
2. Create Venv using python3 -m venv venv
3. Activate using . venv/bin/activate
4. pip3 install -e .
5. Observe Error.

Expected behavior All library dependencies should be expressed in the requirements file.

Actual behavior An undocumented dependency on the python buildtools prevents project setup.

OS and Code tested

• OS: Ubuntu: 20.04.01
• Python Version: 3.8.5

Account Number d0026812cc809bc29c85da6646b288350083d47d4b9a6ab37986f50b7e486653

[DucPhamTV]

Have you tried this? sudo apt install libpq-dev It solved the issue for me.

[derrick-anderson]

That will install the build tools necessary yes, however its smaller and less friction to include the binary instead of the source as a dependency.

I did put up a pr for that change.

[vosi]

From

https://pypi.org/project/psycopg2-binary/

The binary package is a practical choice for development and testing but in production it is advised to use the package built from sources.