摘要：
python中，Microsoft Visual C++ 14.0 or greater is required问题解决方案
下面这个就是出现的问题:
building 'bitarray._bitarray' extension
error: Microsoft Visual C++ 14.0 or greater is required.
Get it with "Microsoft C++ Build Tools": https://visualstudio.microsoft.com/visual-cpp-build-tools/
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