已加载“C:WindowsSysWOW64 tdll.dll” 无法查找或打开 PDB 文件。

manual upgrade

下载pip的源码https://pypi.org/project/pip/#files 

替换lLib->site-packages->pip,pip-*-py*.egg-info

auto upgrade

linux/mac:pip install --upgrade pip
windows: python -m pip install --upgrade pip