Python one-liners

 Thu, 02 Oct 2025 08:57 UTC

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My cheat sheet of python one-liners.

# Alias python3 to simply "python" in .bash_aliases

alias python="python3"

# Reload bashrc
$ source ~/.bashrc

# New virtual environment

python -m venv ~/myproject_env

# Activate environment

source ~/myproject_env/bin/activate

# Deactivate environment

deactivate

# Use the full path to the virtual environment

~/myproject_env/bin/python3 my_script.py

# Alias the full path to the virtual environment's python3

alias myvenv='~/myproject_env/bin/python3'

# Python local server

python -m http.server 8000

Pip

From virtual environment or system Python:

# List installed

pip list

# List outdated

pip list --outdated

# Upgrade everything

for i in $(pip list -o | awk 'NR > 2 {print $1}'); do pip install -U $i; done

# Single module install

pip install <package_name>

# Single module upgrade

pip install <package_name> --upgrade

# Single module uninstall

pip uninstall <package_name>