当我尝试使用不兼容的 python 版本安装 pip 时，如何获得更好的错误消息？

Question

我的 package 仅支持 python 3，使用python_requires='>3.6'从 setuptools 强制执行

当我尝试从 python 2 安装 pip 时，我收到一个模糊的错误

  ERROR: Could not find a version that satisfies the requirement mypackage (from versions: none)
ERROR: No matching distribution found for mypackage

这与我打错了 package 名称的错误相同，这不是很有帮助。

当我使用-vvv运行安装时，我看到 pip 忽略了预期的 py3 包。

Link requires a different Python (2.7.16 not in: u'>=3.6'):
https://mypypiindex (from https://mypypiindex) (requires-python:>=3.6)

我正在开发的 package 面向我公司的大量开发人员，我想向他们说明解释器版本限制。

有没有办法获得更好的错误信息？

我在 GitHub 中看到了讨论，但似乎没有解决方法。

他们来了：

• https://github.com/pypa/pip/issues/5003
• https://github.com/pypa/pip/issues/5915
• https://github.com/pypa/pip/issues/6526

Answer 1

我使用的解决方法是删除python_requires然后在顶部手动检查它

import sys

# we used to use python_requires but we want a better
# error message for people trying to use python 2
MIN_PY_VERSION = (3, 6)
assert sys.version_info >= MIN_PY_VERSION,\
    "ERROR: python version must be greater than {}".format(MIN_PY_VERSION)

当开发人员尝试使用不兼容的 python 版本进行安装时，他们将看到

$ pip install .
DEPRECATION: Python 2.7 will reach the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 won't be maintained after that date. A future version of pip will drop support for Python 2.7. More details about Python 2 support in pip, can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support
Looking in indexes: https://artifactory.local.mycompany.net/artifactory/api/pypi/pypi/simple
Processing XXX
    ERROR: Command errored out with exit status 1:
     command: /XXX/bin/python2.7 -c 'XXX'
         cwd: /private/var/folders/t0/bpn6p6nn3jv_fmz9h_wdlld40003f0/T/pip-req-build-1YAoYX/
    Complete output (5 lines):
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/private/var/folders/XXX/setup.py", line 11, in <module>
        "ERROR: python version must be greater than {}".format(MIN_PY_VERSION)
    AssertionError: ERROR: python version must be greater than (3, 6)
    ----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

注意：如果您从轮子安装，这不起作用，因为它们不运行 setup.py