解決python “No module named pip”

python 升級后導致不能使用原來的pip命令

windows平台

cmd中敲命令：python -m ensurepip

C:\Users\guchen>python -m ensurepip
Requirement already satisfied: setuptools in d:\python27\lib\site-packages
Collecting pip
Installing collected packages: pip
Successfully installed pip-9.0.1

C:\Users\guchen>pip

Usage:
  pip <command> [options]

Commands:
  install                     Install packages.
  download                    Download packages.