Get licenses of all packages in use

get_licenses.py

import pkg_resources
import prettytable

def get_pkg_license(pkg):
    try:
        lines = pkg.get_metadata_lines('METADATA')
    except:
        lines = pkg.get_metadata_lines('PKG-INFO')

    for line in lines:
        if line.startswith('License:'):
            return line[9:]
    return '(Licence not found)'

def print_packages_and_licenses():
    t = prettytable.PrettyTable(['Library', 'License'])
    for pkg in sorted(pkg_resources.working_set, key=lambda x: str(x).lower()):
        t.add_row((str(pkg), get_pkg_license(pkg)))
    print(t)


if __name__ == "__main__":
    print_packages_and_licenses()