pip 19.0 breaks installation of pandas on python 3.4

Environment

• pip version: 19.0
• Python version: 3.4
• OS: Ubuntu 14.04

Description

With the release of pip 19.0, our script for building a Cython extension has broken, at least in Ubuntu 14.04 environments (probably because they’re still using Python 3.4). Specifically, pip install pandas now fails.

Expected behavior

While I understand that pip 19.1 will drop support for Python 3.4, I didn’t expect that in 19.0, nor in this way. I would expect a deprecation warning and for things to continue working as before.

How to Reproduce

1. Set up an Ubuntu 14.04 environment.
2. Upgrade to pip 19.0.
3. pip install pandas.

Output

$ lsb_release -a
...
Description:	Ubuntu 14.04.5 LTS

$ virtualenv -p python3 a
Running virtualenv with interpreter /usr/bin/python3
Using base prefix '/usr'
New python executable in a/bin/python3
Also creating executable in a/bin/python
Installing setuptools, pip...done.
$ source a/bin/activate
(a)$ python --version
Python 3.4.3
(a)$ pip install --upgrade pip
Downloading/unpacking pip from https://files.pythonhosted.org/packages/60/64/73b729587b6b0d13e690a7c3acd2231ee561e8dd28a58ae1b0409a5a2b20/pip-19.0-py2.py3-none-any.whl#sha256=249ab0de4c1cef3dba4cf3f8cca722a07fc447b1692acd9f84e19c646db04c9a
  Downloading pip-19.0-py2.py3-none-any.whl (1.4MB): 1.4MB downloaded
Installing collected packages: pip
  Found existing installation: pip 1.5.4
    Uninstalling pip:
      Successfully uninstalled pip
Successfully installed pip
Cleaning up...
(a)$ pip --version
pip 19.0 from /home/jenkins-slave/a/lib/python3.4/site-packages/pip (python 3.4)
(a)$ pip install pandas
DEPRECATION: Python 3.4 support has been deprecated. pip 19.1 will be the last one supporting it. Please upgrade your Python as Python 3.4 won't be maintained after March 2019 (cf PEP 429).
Collecting pandas
  Using cached https://files.pythonhosted.org/packages/08/01/803834bc8a4e708aedebb133095a88a4dad9f45bbaf5ad777d2bea543c7e/pandas-0.22.0.tar.gz
  Installing build dependencies ... done
  Getting requirements to build wheel ... error
  Complete output from command /home/jenkins-slave/a/bin/python3 /home/jenkins-slave/a/lib/python3.4/site-packages/pip/_vendor/pep517/_in_process.py get_requires_for_build_wheel /tmp/tmpsknqc6o3:
  Traceback (most recent call last):
    File "/home/jenkins-slave/a/lib/python3.4/site-packages/pip/_vendor/pep517/_in_process.py", line 207, in <module>
      main()
    File "/home/jenkins-slave/a/lib/python3.4/site-packages/pip/_vendor/pep517/_in_process.py", line 197, in main
      json_out['return_val'] = hook(**hook_input['kwargs'])
    File "/home/jenkins-slave/a/lib/python3.4/site-packages/pip/_vendor/pep517/_in_process.py", line 54, in get_requires_for_build_wheel
      return hook(config_settings)
    File "/tmp/pip-build-env-z5ha9gs9/overlay/lib/python3.4/site-packages/setuptools/build_meta.py", line 115, in get_requires_for_build_wheel
      return _get_build_requires(config_settings, requirements=['wheel'])
    File "/tmp/pip-build-env-z5ha9gs9/overlay/lib/python3.4/site-packages/setuptools/build_meta.py", line 101, in _get_build_requires
      _run_setup()
    File "/tmp/pip-build-env-z5ha9gs9/overlay/lib/python3.4/site-packages/setuptools/build_meta.py", line 85, in _run_setup
      exec(compile(code, __file__, 'exec'), locals())
    File "setup.py", line 27, in <module>
      import versioneer
  ImportError: No module named 'versioneer'
  
  ----------------------------------------

[dstufft]

@marcosamorim You’re looking for #6158, this appears to be a different issue.

[lock[bot]]

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