Already solved! Soft link python to /usr/bin/python. I’m really speechless. My previous soft link address was /usr/local/bin/python. And my PATH path also contains /usr/local/bin. It's also posted in the question.
I don’t know why it must be under the path /usr/bin/python. #todo
Add the path to the python executable file to the system environment variable
PATH
Try changing to a different Python version
Already solved!
Soft link python to /usr/bin/python.
I’m really speechless. My previous soft link address was /usr/local/bin/python.
And my PATH path also contains /usr/local/bin. It's also posted in the question.
I don’t know why it must be under the path /usr/bin/python. #todo