问题：今天安装canvas的时候，报错提示python: command not found

/bin/bash下不好使

ln -s /usr/bin/python3 /usr/local/bin/python

zsh下不好使：

解决办法：

# bash

MacBook-Pro ~ % echo "alias python=/usr/bin/python3" >> ~/.zshrc
MacBook-Pro ~ % source ~/.zshrc
MacBook-Pro ~ % echo "alias python=/usr/bin/python3" >> ~/.bash_profile
MacBook-Pro ~ % source ~/.bash_profile