Python 2.7 installing opencv via pip (virtual environment)

Question

I'm attempting to install the opencv-python package through pip inside virtual environment (Python 2.7). Sadly, I'm getting this error: 

(venv) $ pip2 install opencv-python

DEPRECATION: Python 2.7 reached the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 is no longer maintained. pip 21.0 will drop support for Python 2.7 in January 2021. More details about Python 2 support in pip can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support

Collecting opencv-python

  Using cached opencv-python-4.3.0.38.tar.gz (88.0 MB)

  Installing build dependencies ... done

  Getting requirements to build wheel ... error

  ERROR: Command errored out with exit status 1:

   command: /home/pc_user/.venvs/venv/bin/python /home/pc_user/.venvs/venv/lib/python2.7/site-packages/pip/_vendor/pep517/_in_process.py get_requires_for_build_wheel /tmp/tmp7q7z4L

       cwd: /tmp/pip-install-C21PKF/opencv-python

  Complete output (22 lines):

  Traceback (most recent call last):

    File "/home/pc_user/.venvs/venv/lib/python2.7/site-packages/pip/_vendor/pep517/_in_process.py", line 280, in <module>

      main()

    File "/home/pc_user/.venvs/venv/lib/python2.7/site-packages/pip/_vendor/pep517/_in_process.py", line 263, in main

      json_out['return_val'] = hook(**hook_input['kwargs'])

    File "/home/pc_user/.venvs/venv/lib/python2.7/site-packages/pip/_vendor/pep517/_in_process.py", line 114, in get_requires_for_build_wheel

      return hook(config_settings)

    File "/tmp/pip-build-env-2FzygL/overlay/lib/python2.7/site-packages/setuptools/build_meta.py", line 146, in get_requires_for_build_wheel

      return self._get_build_requires(config_settings, requirements=['wheel'])

    File "/tmp/pip-build-env-2FzygL/overlay/lib/python2.7/site-packages/setuptools/build_meta.py", line 127, in _get_build_requires

      self.run_setup()

    File "/tmp/pip-build-env-2FzygL/overlay/lib/python2.7/site-packages/setuptools/build_meta.py", line 243, in run_setup

      self).run_setup(setup_script=setup_script)

    File "/tmp/pip-build-env-2FzygL/overlay/lib/python2.7/site-packages/setuptools/build_meta.py", line 142, in run_setup

      exec(compile(code, __file__, 'exec'), locals())

    File "setup.py", line 448, in <module>

      main()

    File "setup.py", line 99, in main

      % {"ext": re.escape(sysconfig.get_config_var("EXT_SUFFIX"))}

    File "/usr/lib/python2.7/re.py", line 210, in escape

      s = list(pattern)

  TypeError: 'NoneType' object is not iterable

  ----------------------------------------

ERROR: Command errored out with exit status 1: /home/pc_user/.venvs/venv/bin/python /home/pc_user/.venvs/venv/lib/python2.7/site-packages/pip/_vendor/pep517/_in_process.py get_requires_for_build_wheel /tmp/tmp7q7z4L Check the logs for full command output.

I've attempted to establish another environment or installing it through python2 - m pip install yet the impact is the equivalent. What's the issue?

Answer 1

Python 2.7 isn't upheld any more in opencv-python-4.3.0.38. Support were dropped in 4.3.0.36; 

The workaround I discovered was to install the opencv-python version 4.2.0.32 (which is the most recent upheld for Python 2.7, see this for all releases) like this:

pip install opencv-python==4.2.0.32

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