打算安装pyqt5，然后pip install PyQt5
报错：
Command "g:\python3.7\python.exe g:\python3.7\lib\site-packages\pip install --ignore-installed --no-user --prefix C:\Users\用户\AppData\Local\Temp\pip-build-env-o2fimxzi\overlay --no-warn-script-location --no-binary :none: --only-binary :none: -i https://pypi.org/simple -- "sip >=6.4, <7" "PyQt-builder >=1.9, <2"" failed with error code 2 in None
可以下载，但是安装不行。
然后发现是没安装sip，于是pip install sip
还是报错：
Command "g:\python3.7\python.exe g:\python3.7\lib\site-packages\pip\_vendor\pep517\_in_process.py prepare_metadata_for_build_wheel C:\Users\用户\AppData\Local\Temp\tmp8voqpa7g" failed with error code 1 in C:\Users\用户\AppData\Local\Temp\pip-install-_xhpmsom\sip
于是接着搜索，发现是没有wheel模块，接着pip install wheel
wheel安装成功！
继续pip install sip
报错：
error: Microsoft Visual C++ 14.0 is required. Get it with "Microsoft Visual C++ Build Tools": https://visualstudio.microsoft.com/downloads/
----------------------------------------
Failed building wheel for sip
Running setup.py clean for sip
Failed to build sip
Could not build wheels for sip which use PEP 517 and cannot be installed directly
搜索发现是缺少Visual C++ 14.0。
按照Microsoft Visual C++ 14.0 is required解决方法 - 知乎 (zhihu.com)
的办法成功安装VC++
继续pip install sip
sip安装成功！
接着pip install PyQt5还是失败
报错中有：
AttributeError: module 'sipbuild.api' has no attribute 'prepare_metadata_for_build_wheel'
然后Google，找到python - AttributeError: module 'sipbuild.api' has no attribute 'prepare_metadata_for_build_wheel' for PyQt5 5.15.0 - Stack Overflow
此时我默认安装的版本是PyQt5 5.15.6，这篇文章的哥们也是这个问题，下面有个回复解释了一下，然后给出了解决办法：安装指定版本文章来源：https://www.toymoban.com/news/detail-443440.html
python -m pip install PyQt5==5.15.2于是成功安装pyqt5！ 文章来源地址https://www.toymoban.com/news/detail-443440.html
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