问题遇到的现象和发生背景
######Traceback (most recent call last):
File "d:\program files\python36\lib\runpy.py", line 193, in run_module_as_main
"main", mod_spec)
File "d:\program files\python36\lib\runpy.py", line 85, in run_code
exec(code, run_globals)
File "D:\Program Files\Python36\Scripts\pip.exe_main.py", line 5, in
File "d:\program files\python36\lib\site-packages\pip_init.py", line 21, in
from pip._vendor.requests.packages.urllib3.exceptions import DependencyWarning
ModuleNotFoundError: No module named 'pip._vendor.requests'