python code that allows to get a list of all versions of a package that are available on PyPi

pip-all-versions-of-package.py

import contextlib
import pip
import re

@contextlib.contextmanager
def capture():
    import sys
    from io import StringIO
    oldout,olderr = sys.stdout, sys.stderr
    try:
        out=[StringIO(), StringIO()]
        sys.stdout,sys.stderr = out
        yield out
    finally:
        sys.stdout,sys.stderr = oldout, olderr
        out[0] = out[0].getvalue()
        out[1] = out[1].getvalue()


def all_versions_of_package(package_name):
    with capture() as out:
        pip.main(['install', '{}=='.format(package_name)])

    _, err_msg = out
    dirty_msg, *_ = err_msg.split('\n')

    versions = re.findall(r'\d+\.\d+\.\d+', dirty_msg)
    return versions

print(all_versions_of_package('django'))