ImportError: No module named site - mac

问题

I have had this problem for months. every time that I want to get a new python package and use it I get this error in terminal:

ImportError: No module named site

I don't know why do I get this error. actually, I can't use any new package because every time that I wanna install one I get this error. I searched and I found out that the problem would be for PYTHONPATH and PYTHONHOME but I don't know what they are and how can I change them. My operating system is mac os and I don't know how to solve this problem in mac.

every time that I open the terminal I use these two commands to solve the problem:

unset PYTHONHOME
unset PYTHONPATH

but the next time I get the error again.

回答1:

The Python tooling is evolving in Mac OS X such that Python 2.7 is being deprecated. System default paths may no longer apply as I learned after upgrading to Mac OS X Catalina (10.15.x). There are a few scenarios here:

GENERIC FIX -- According to this primer on the site package and Python internal paths, Python 2.7 requires a specific user path for site packages. The solution I settled on was simply this:
```
mkdir -p ~/.local/lib/python2.7/site-packages
```
At that point you will have a dedicated directory for Python modules (for Python to function). (NOTE that the error ImportError: No module named site is misleading as it really indicates that the correct directory structure didn't exist to allow the site module to properly load.)
BASIC ALTERNATIVE -- Is your PYTHONHOME pointing to Python3 and your python --version reporting 2.7? Does python3 --version report something different (or work at all)? This error started happening for me after the Catalina upgrade when I was trying to use built-ins. Check your .profile and .bash_profile to see if they are explicitly setting a custom PYTHONHOME and/or PYTHONPATH. One option is to change that so the ENV variables are set explicitly and manually only when a newer Python is needed. You may consider symlinking python3 and pip3 to leave the standard commands to the OS.
DEBUGGING -- If you would like to test and/or get more information, try executing Python in one of the increasingly verbose modes:
```
python -v
python -vv
python -vvv
```

来源：https://stackoverflow.com/questions/56155402/importerror-no-module-named-site-mac

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python

terminal