Find out-of-date modules

pyv.py

import json
from distutils.version import LooseVersion

import pip

try:
    from urllib.request import urlopen
except ImportError:
    from urllib2 import urlopen

POOLSIZE = 10

def get_sys_list():

    return [
        (dis.project_name, dis.version)
        for dis in pip.get_installed_distributions()
    ]


def latest_version(package):

    url = 'http://pypi.python.org/pypi/{0}/json'.format(package)
    try:
        return json.loads(
            urlopen(url).read().decode('utf-8')
            )['info']['version']
    except:
        return '0'


def isoutdated(cv, lv):

    return LooseVersion(cv) < LooseVersion(lv)


def find_outofdate(package):

    latest = latest_version(package[0])
    if isoutdated(package[1], latest):
        print("{0}: {1} ~> {2}".format(package[0], package[1], latest))


def main():

    try:
        from concurrent.futures import ThreadPoolExecutor

        with ThreadPoolExecutor(POOLSIZE) as executor:
            for p in get_sys_list():
                executor.submit(find_outofdate, p)

    except ImportError:
        from multiprocessing import Pool

        pool = Pool(processes=POOLSIZE)
        pool.map(find_outofdate, get_sys_list())



if __name__ == '__main__':
    main()