upgrade all #python packages using #pip

pip_upgrade_all.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""
Traverses all the Python packages and upgrades them.
"""

from __future__ import print_function
from __future__ import unicode_literals

import os
import pip


def get_exceptions():
    """
    Returns the list of exceptions, that is, packages that are
    not be upgraded.
    """
    # Add the exceptions into the following variable,
    # each to a separate line.
    exceptions = """
    Django
    """.strip()

    lst_exceptions = exceptions.split("\n")
    lst_exceptions = [x.lower().strip()
                      for x in lst_exceptions if len(x.strip()) > 0]
    return lst_exceptions


def main():
    """
    Main module.
    """
    lst_exceptions = get_exceptions()
    try:
        # check if we have pip.get_installed_distributions()
        print(pip.get_installed_distributions)
        packages = [dist.project_name
                    for dist in pip.get_installed_distributions()]
    except AttributeError:
        # AttributeError:
        #     module 'pip' has no attribute 'get_installed_distributions'
        # This pip version does not support get_installed_distributions()
        # So, use the one in newer versions:
        import pkg_resources
        packages = [dist.project_name for dist in pkg_resources.working_set]
        print(pkg_resources.working_set)
        print(type(pkg_resources.working_set))

    for package in packages:
        if package.lower() not in lst_exceptions:
            command = "pip install --upgrade " + package
            print(command)
            os.system(command)


if __name__ == '__main__':
    main()