mac brew install specific python version

 

1. Install the required version:

    % brew install python@3.7
    % brew list | grep python
    % brew ls python@3.7
    % ls -l /usr/local/Cellar/python@3.7/3.7.8_1/bin/python3.7
   

2. Add a soft link to /usr/local/bin/:

    % ln -s /usr/local/Cellar/python@3.7/3.7.8_1/bin/python3.7 /usr/local/bin/python3.7
    % python3.7 -V
   

3. Create a Python virtual environment:

    % python3.7 -m venv venv37
   

4. Enter the virtual environment:

    % source venv37/bin/activate
   

5. Exit the virtual environment:

    % deactivate