Windows PIP UPGRADE can't used it.

[liyiliuxingyu]

• Pip version:19.0
• Python version:python 3.7.2
• Operating system:Windows

After updating pip, any Third party library didn't install。
e.g.
#> python37 -m pip install -U numpy
Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple
Requirement already up-to-date: numpy in d:\programdata\python\python37\lib\site-packages (1.16.0)
Exception:
Traceback (most recent call last):
File "D:\ProgramData\python\Python37\lib\site-packages\pip-19.0-py3.7.egg\pip_internal\cli\base_command.py", line 176, in main
status = self.run(options, args)
File "D:\ProgramData\python\Python37\lib\site-packages\pip-19.0-py3.7.egg\pip_internal\commands\install.py", line 346, in run
session=session, autobuilding=True
File "D:\ProgramData\python\Python37\lib\site-packages\pip-19.0-py3.7.egg\pip_internal\wheel.py", line 848, in build
assert building_is_possible
AssertionError

[pradyunsg]

Closing as a duplicate of #6158.

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.