如何将 Python 3.7 包与 Python 3.9 解释器一起使用？

Question

The system I'm using is MacOS Big Sur 11.2.1. After I used Homebrew to upgrade everything on the system, I automatically upgraded Python 3.7 to 3.9, which caused my previous installed Python 3.7 packages not to be found under Python 3.9. Can I use the Python 3.7 package with the Python 3.9 interpreter? If you can. How do you do that? By the way, I found all the packages I had installed under Python 3.7。

In addition, I will use the command brew search python3@ , return results boost - Python3
Python@3.7 Python@3.8 Python@3.9 ✅ , and I will use the command brew Search Python@3.7 , Did not find Python 3.7 in the path he suggested. It has all become Python 3.9

Answer 1

type pip freeze with your old version of python, then, make a doc call t.txt, copy what your pip shown in it, then, save under code as a python file and run it on your new python, give it some time, it should work!

import os
try:
    with open("t.txt") as f:
        l = f.readlines()
    print(l)
    for i in l:
        os.system(f"pip install {i}")
except Exception as e:
    print(e)
input()