python -m pip install --upgrade pip 失败

升级PIP

python -m pip install --upgrade pip -i https://pypi.douban.com/simple

C:Usersdangzhengtao>python -m pip install --upgrade pip -i https://pypi.douban.com/simple
Looking in indexes: https://pypi.douban.com/simple
Collecting pip
  Downloading https://pypi.doubanio.com/packages/00/b6/9cfa56b4081ad13874b0c6f96af8ce16cfbc1cb06bedf8e9164ce5551ec1/pip-19.3.1-py2.py3-none-any.whl (1.4MB)
    100% |████████████████████████████████| 1.4MB 1.3MB/s
Installing collected packages: pip
  Found existing installation: pip 18.0
    Uninstalling pip-18.0:
      Successfully uninstalled pip-18.0
Successfully installed pip-19.3.1

C:Usersdangzhengtao>python -m pip install --upgrade pip -i https://pypi.douban.com/simpleLooking in indexes: https://pypi.douban.com/simpleCollecting pip  Downloading https://pypi.doubanio.com/packages/00/b6/9cfa56b4081ad13874b0c6f96af8ce16cfbc1cb06bedf8e9164ce5551ec1/pip-19.3.1-py2.py3-none-any.whl (1.4MB)    100% |████████████████████████████████| 1.4MB 1.3MB/sInstalling collected packages: pip  Found existing installation: pip 18.0    Uninstalling pip-18.0:      Successfully uninstalled pip-18.0Successfully installed pip-19.3.1