Pip list all versions of a package that are available

pip_list_available_package_versions.py

import json
import urllib2
from distutils.version import StrictVersion
from distutils.version import LooseVersion

def versions(package_name):
    url = "https://pypi.python.org/pypi/%s/json" % (package_name,)
    data = json.load(urllib2.urlopen(urllib2.Request(url)))
    versions = data["releases"].keys()
    try:
        versions.sort(key=StrictVersion)
    except ValueError as e:
        if 'invalid version number' in str(e):
            versions.sort(key=LooseVersion)
        else:
            raise e
    return versions

print "\n".join(versions("Jinja2"))

Thanks!
Also for python3 version.