update library python code example

Example 1: how to update a module in python

pip install [package] --upgrade

Example 2: update all modules python in cmd

import pkg_resources
from subprocess import call

packages = [dist.project_name for dist in pkg_resources.working_set]
call("pip install --upgrade " + ' '.join(packages), shell=True)

Example 3: pip upgrade python

pip freeze | %{$_.split('==')[0]} | %{pip install --upgrade $_}