解决pip更新后的异常:No module named 'pip'

1、报错内容：Traceback (most recent call last):
File "d:\python36\lib\runpy.py", line 193, in _run_module_as_main
"main", mod_spec)
File "d:\python36\lib\runpy.py", line 85, in run_code
exec(code, run_globals)
File "D:\Python36\Scripts\pip3.6.exe_main.py", line 5, in
ModuleNotFoundError: No module named 'pip._internal'
2、cmd窗口：输入Python -m ensurepip
3、cmd窗口：输入python -m pip install --upgrade pip
4、修复完成