Python：别名为 python3

Question

I tried to upgrade python 2.7 to python 3 and I modified the file ~/.bash_aliases but when I type python in elementary terminal I get this error

zsh: command not found: python3

and when I type which python

python: aliased to python3

actually I prefer return to python 2.7 or if someone know how can I fix this:c

Answer 1

Go into your .zshrc file. Is there a line that reads:

alias python='python3'

If so, remove that line. Else, check if you can run python2 , python2.7 , or something like that. If so, then just hack and add the line

alias python='python2'

Or whatever your python2 is. Else, type

sudo apt-get install python2.7

Or whatever is the appropriate method for installing programs on your system.

Answer 2

Follow this steps if you are using macOS.

1. Install Python with brew: brew install python . This will install the latest version of Python. If you want Python 2.7, do well to specify the version.
2. Check the path where this Python was installed: brew info python . You will see a path similar to: /usr/local/opt/python@3.9/libexec/bin
3. Make home brew Python default:

$ echo 'export PATH="/usr/local/opt/python@3.9/libexec/bin:$PATH"' >> ~/.zshrc

4. Source the file to apply changes without restarting the terminal: source ~/.zshrc