The solution uses ：
python -m pip install --upgrade pip to update pip
[email protected]:~ $ python -m pip install --upgrade pip
Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
Collecting pip
Downloading https://files.pythonhosted.org/packages/96/2f/caec18213f6a67852f6997fb0673ae08d2e93d1b81573edb93ba4ef06970/pip-22.1.2-py3-none-any.whl (2.1MB)
|████████████████████████████████| 2.2MB 26kB/s
Installing collected packages: pip
Found existing installation: pip 19.2.3
Uninstalling pip-19.2.3:
ERROR: Could not install packages due to an EnvironmentError: [Errno 13] Permission denied: '/home/pi/python3.7/bin/pip3'
Consider using the `--user` option or check the permissions.
WARNING: You are using pip version 19.2.3, however version 22.1.2 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
[email protected]:~ $ python -m pip install --upgrade pip --user
Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
Collecting pip
Using cached https://files.pythonhosted.org/packages/96/2f/caec18213f6a67852f6997fb0673ae08d2e93d1b81573edb93ba4ef06970/pip-22.1.2-py3-none-any.whl
Installing collected packages: pip
Successfully installed pip-22.1.2
WARNING: You are using pip version 19.2.3, however version 22.1.2 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
[email protected]:~ $ pip list
