c:\users\administrator\appdata\local\programs\python\python38\python.exe -m pip install --upgrade pippip源升级方法
[global]
index-url=http://mirrors.aliyun.com/pypi/simple/
timeout = 6000
[install]
trusted-host=mirrors.aliyun.com1 个月后
pip install cryptography -i https://mirrors.aliyun.com/pypi/simple
1 年后
pip install watchdog -i https://mirrors.aliyun.com/pypi/simple
pip install requests -i https://mirrors.aliyun.com/pypi/simple