pip 给出错误 ModuleNotFoundError: No module named 'enum'

Question

Running python 3.7.7 on Windows 7 x64. I've just upgraded from python 2.7 and I'm trying to install the module emcee using pip install emcee . Pip threw the error ModuleNotFoundError: No module named 'enum' . I've also tried installing modules matplotlib, enum34, and numpy, but all threw the same error. I've also tried to upgrade pip with pip install --upgrade pip , which again threw the same error. I've looked into my \\python37\\lib folder, and enum.py is present right where it's supposed to be, but it's still not working.

Please help.

Answer 1

Could you please confirm that you have python installed ie it's upgraded and in existence. You can do this by typing python in the cmd or terminal window. This should push you into a python shell. If it does not do so. Trying reinstalling python. May be the upgrade did not work so well.

Answer 2

enum is part of the standard library for Python 3.7, and you've confirmed that it's there. Therefore the error raises the suspicion that, when you're launching pip , it might be getting executed by a Python distribution/installation other than the one you think it is. One way to make sure it's working on the correct distro is to say:

C:\WHATEVER\PATH\TO\python.exe -m pip install emcee

This is more precise than just typing pip at the command-line, because in the latter case you just have to hope/assume that the first pip Windows finds on its %Path% will be the correct one. That's not always the case.