Today I put the python upgraded to 3.7.4, hence the need to install a variety of modules, such as PyQt5, pyinstaller, requests the modules are often used
So I open the CMD input
PIP install pyinstaller
Turn the incredibly tip no consistent version for a while! So I use the Internet finally found the solution to such problems
First PIP install some modules need wheel support this module to install success
PIP install wheel
And the cause of the network may also lead to the failure modules installed

After adding domestic mirror speed will be a lot faster
-i http://pypi.douban.com/simple/- trusted - host pypi.douban.com behind means trust this site

To use PIP install pyinstaller -i http://pypi.douban.com/simple/- trusted - host pypi.douban.com can successfully won't appear no corresponding version

And friend to install without success can go to https://www.lfd.uci.edu/~gohlke/pythonlibs/to download in the local installation
If also need to install the wheel module oh

The above basic can solve the problem of most install the library failed

I use the method above a few minutes to download so much module

The first post, the hope can help you

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