python -m pip install --upgrade pip执行总是不成功
加了源也不成功python -m pip install --upgrade pip -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com
错误
Installing collected packages: pip
Found existing installation: pip 19.1.1
Uninstalling pip-19.1.1:
Successfully uninstalled pip-19.1.1
Rolling back uninstall of pip
Moving to c:\users\msi-pc\appdata\roaming\python\python37\scripts\pip.exe
from C:\Users\MSI-PC\AppData\Local\Temp\pip-uninstall-0okgd6cq\pip.exe
Moving to c:\users\msi-pc\appdata\roaming\python\python37\scripts\pip3.7.exe
from C:\Users\MSI-PC\AppData\Local\Temp\pip-uninstall-0okgd6cq\pip3.7.exe
Moving to c:\users\msi-pc\appdata\roaming\python\python37\scripts\pip3.exe
from C:\Users\MSI-PC\AppData\Local\Temp\pip-uninstall-0okgd6cq\pip3.exe
Moving to c:\users\msi-pc\appdata\roaming\python\python37\site-packages\pip-19.1.1.dist-info\
from c:\users\msi-pc\appdata\roaming\python\python37\site-packages\~ip-19.1.1.dist-info
Moving to c:\users\msi-pc\appdata\roaming\python\python37\site-packages\pip\
from c:\users\msi-pc\appdata\roaming\python\python37\site-packages\~ip
ERROR: Exception:
解决办法：只要在“python -m pip install --upgrade pip“后加上--user，这个问题就能解决，即“python -m pip install --upgrade pip --user”
