pip3 指向 python 3.8 和 jupyter notebook 指向 python 3.9。 无法同步两者

Question

which pip3:

/Library/Frameworks/Python.framework/Versions/3.8/bin/pip3

python version in notebook:

import platform
print(platform.python_version())

3.9.2

I want my jupyter notebook to run on python 3.8.

NOTE: I'm intentionally avoiding conda for this exercise.

Answer 1

Jupyter is installed into a particular Python environment like any other Python module. If Jupyter is running under Python 3.9, then you're running the version of it that was installed by the pip in Python 3.9. It might be installed in the base 3.9 implementation, or it could be installed in a virtual environment that is based on Python 3.9.

If you want a Jupyter that is running under Python 3.8, then you need to run the version of it that is installed under Python 3.8 or a virtual environment based on 3.8. If no such version exists, then you need to install it using Python 3.8 pip. Once installed, you need to run that version of it. You can always do that by specifying the full path to the appropriate jupyter binary. But that is, of course, not ideal...

Which version you get when you run just jupyter is a function of your PATH and/or any Python package manager you might be running. I use pyenv , and that tool will set it up so that for the Python version I've chosen to be the current global version, that version's (or virtual environment's) bin directory becomes the first Python bin directory in my PATH. So if I type jupyter , I always run the version that is installed in what pyenv has made the current global Python environment.