Python --version does not update

问题

I upgraded and installed latest Python version 3.8.1.

Problem is, when I type

python --version

on terminal I get Python 2.7.16, when I type

python3 --version

I get Python 3.8.1. But if I try to

pip install -U selenium

I get a message:

"DEPRECATION: Python 2.7 reached the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 is no longer maintained. A future version of pip will drop support for Python 2.7. More details about Python 2 support in pip, can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support"

I dont understand why is it running on Python 2.7

回答1:

Never call the pip or pip3 scripts directly unless you really understand what the implications are.

Instead always prefer calling the exact Python interpreter you are targeting and tell it to run the pip module:

• path/to/my/pythonX.Y -m pip
• path/to/my/python -m pip
• pythonX.Y -m pip
• python3 -m pip
• python -m pip

I recommend reading Brett Cannon's article "Why you should use python -m pip".

回答2:

The Python executable is found under the bin directory but the pip executable is under the Scripts directory. Check your path to see which Scripts directory is encountered first ? Most probably it would be the Python 2.7. I encountered the same issue and found that my Python 2.7 Scripts directory was before the Python 3.8 Scripts directory but Python 3.8 bin was before Python 2.7 bin directory in the Path variable.

来源：https://stackoverflow.com/questions/60348649/python-version-does-not-update