When I try to run pip in the Windows Command Prompt, pip -V works fine, but when I try to run it in PyCharm terminal I get 'pip' is not recognized as an internal or external command, operable program or batch file.
My Path environmental variables are set for:
C:\Users\username\AppData\Local\Programs\Python\Python37\Scripts\
C:\Users\username\AppData\Local\Programs\Python\Python37\
C:\Users\username\AppData\Roaming\Python\Python37\Scripts\
C:\Users\username\AppData\Roaming\Python\Python37\
The main difference I can think of is that the PyCharm terminal and project opens on D:, and my path variables are set to C: but I don't know why that would affect it. I have recently uninstalled and reinstalled both PyCharm and Python (a previous version) if that helps, but I made it a point to not import any settings.
This is a potential duplicate of this question but it's also unresolved.
Answer to my own question: when things don't make sense, try turning it off and on again. Problem was fixed with a restart.