pip_list_versions.py

import argparse
import logging
import re
import subprocess


def pip_show(package_name, packages=[]):
    if package_name in packages:
        return # avoid checking the same package twice if multiple packages depends on it.
    packages.append(package_name)

    result = subprocess.run(['pip', 'show', package_name], stdout=subprocess.PIPE)
    if result.returncode != 0:
        logging.error("pip show %s failed", package_name)
    
    show_stdout = result.stdout.decode("utf-8")
    print(package_name + "==" + get_version(show_stdout))

    for dependency in get_dependencies(show_stdout):
        pip_show(dependency, packages=packages)

def get_version(show_stdout):
    for line in show_stdout.split("\n"):
        m = re.match(r"^Version:\s(?P<version>.+)$", line)
        if m:
            return m.group('version')
    return "not found"

def get_dependencies(show_stdout):
    for line in show_stdout.split("\n"):
        m = re.match(r"^Requires:\s(?P<requires>.+)$", line)
        if m:
            return m.group('requires').split(', ')
    return []


if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument('package', type=str, help='package name')
    args = parser.parse_args()
    
    pip_show(args.package)