Check Python version
Type here
python3 --version
Create a Python virtual environment
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python3 -m venv env
Activate a virtual environment on Linux or Mac
Type here
source env/bin/activate
Deactivate the current virtual environment
Type here
deactivate
Install a Python package
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pip install package-name
Install all packages from a requirements file
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pip install -r requirements.txt
Save current environment packages to a file
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pip freeze > requirements.txt
List installed Python packages
Type here
pip list
Run a Python script
Type here
python3 script.py
Run a Python script and save output to a file
Type here
python3 script.py > output.txt
Run a Python one-liner from the terminal
Type here
python3 -c "print('hello')"