输入pip3 -V,提示Fatal error in launcher: Unable to create process using '"'
使用python3 -m pip install --upgrade pip命令更新即可,
但是尝试输入后显示Requirement already up-to-date: pip in c:\python35\lib\site-packages,问题并没有解决.
发现需强制安装,输入命令
python3 -m pip install --upgrade pip --force-reinstall,
显示Successfully installed pip-9.0.1,
再次输入命令pip3 -V,显示pip 9.0.1 from c:\python35\lib\site-packages (python 3.5),问题解决。