instead of typing in "python". try using "py". for ex:
py -m pip install packagename
py -m pip --install packagename
py -m pip --upgrade packagename
py -m pip upgrade packagename
note: this should be done in the command prompt "cmd" and not in python idle. also FYI pip is installed with python 3.6 automatically.
~ Answered on 2017-10-15 16:20:25