Error reporting:

zsh: command not found: pip3

zsh: command not found: pip

Reason: it seems that this problem occurred after my PIP update failed

Solution:

Official website solution

Execute at the terminal first:

curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py

Get the get pip. Py file in the current directory

Then execute in the current directory:

sudo python3 get-pip.py

Then pip is installed successfully