有時安裝的pip版本過低，用pip安裝軟件時會報python

pip._vendor.distlib.DistlibException: Unable to locate finder for 'pip._vendor.distlib'

這時須要卸載掉pip setuptools，從新安裝下bootstrap

1. uninstall current pip:spa

   python -m pip uninstall pip setuptools

2. download get-pip.py from https://bootstrap.pypa.io/get-pip.pycode

3. execute get-pip script:ip

   python get-pip.py

4. virtualenv新建的直接python get-pip.py就能夠 --！