import pip._internal
print(pip._internal.pep425tags.get_supported())
*WIN32
import pip
print(pip.pep425tags.get_supported())
====== pip下载临时指定清华源 ======
''-i https://pypi.tuna.tsinghua.edu.cn/simple''
===== pip配置源 =====
''pip config set global.index-url https://pypi.mirrors.ustc.edu.cn/simple/''