尝试在 python 2.7 上安装 opencv-python 包 4.3 时出错

Question

当我尝试在 python 2.7 上使用带有pip install opencv-python 的 pip 安装 opencv-python 4.3.0.38 时，我收到以下错误。

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: /System/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python /Library/Python/2.7/site-packages/pip/_vendor/pep517/_in_process.py get_requires_for_build_wheel /var/folders/ch/hg1k0nj940g6n47qv36jjzs00000gn/T/tmpmJirQh
       cwd: /private/var/folders/ch/hg1k0nj940g6n47qv36jjzs00000gn/T/pip-install-rayarg/opencv-python
  Complete output (22 lines):
  Traceback (most recent call last):
    File "/Library/Python/2.7/site-packages/pip/_vendor/pep517/_in_process.py", line 280, in <module>
      main()
    File "/Library/Python/2.7/site-packages/pip/_vendor/pep517/_in_process.py", line 263, in main
      json_out['return_val'] = hook(**hook_input['kwargs'])
    File "/Library/Python/2.7/site-packages/pip/_vendor/pep517/_in_process.py", line 114, in get_requires_for_build_wheel
      return hook(config_settings)
    File "/private/var/folders/ch/hg1k0nj940g6n47qv36jjzs00000gn/T/pip-build-env-_bx9RN/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 "/private/var/folders/ch/hg1k0nj940g6n47qv36jjzs00000gn/T/pip-build-env-_bx9RN/overlay/lib/python2.7/site-packages/setuptools/build_meta.py", line 127, in _get_build_requires
      self.run_setup()
    File "/private/var/folders/ch/hg1k0nj940g6n47qv36jjzs00000gn/T/pip-build-env-_bx9RN/overlay/lib/python2.7/site-packages/setuptools/build_meta.py", line 243, in run_setup
      self).run_setup(setup_script=setup_script)
    File "/private/var/folders/ch/hg1k0nj940g6n47qv36jjzs00000gn/T/pip-build-env-_bx9RN/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 "/System/Library/Frameworks/Python.framework/Versions/2.7/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: /System/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python /Library/Python/2.7/site-packages/pip/_vendor/pep517/_in_process.py get_requires_for_build_wheel /var/folders/ch/hg1k0nj940g6n47qv36jjzs00000gn/T/tmpmJirQh Check the logs for full command output.

我该如何解决这个问题？我错过了什么吗？

Answer 1

opencv-python 版本 4.3.0.38 在 Python 2.7 上不受支持。你可以check this issue for more information.

您应该改用 Python 3，或者作为 Python 2.7 的解决方法，您可以安装与您的 Python 版本兼容的 opencv-python 的最旧版本，例如 4.2.0.32。使用：

pip install opencv-python==4.2.0.32