Figure out what verions of python packages are compatible with each other

all_versions.py

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

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:
      versions.sort()
    return versions


if __name__ == "__main__":
    print "\n".join(versions(sys.argv[1]))

doesitworkyet.py

import itertools
import subprocess


packages = {
    'celery': [
        '3.0.25',
        '3.1.0',
        '3.1.1',
        '3.1.2',
        '3.1.3',
        '3.1.4',
        '3.1.5',
        '3.1.6',
        '3.1.7',
        '3.1.8',
        '3.1.9',
        '3.1.10',
        '3.1.11',
        '3.1.12',
        '3.1.13',
        '3.1.14',
        '3.1.15',
        '3.1.16',
        '3.1.17',
        '3.1.18',
        '3.1.19',
        '3.1.20',
        '3.1.21',
        '3.1.22',
        '3.1.23',
    ],
    'redis': [
        '2.9.1',
        '2.10.0',
        '2.10.1',
        '2.10.2',
        '2.10.3',
        '2.10.5',
    ],
    'django-redis': [
        '3.7.2',
        '3.8.0',
        '3.8.1',
        '3.8.2',
        '3.8.3',
        '3.8.4',
        '4.0.0',
        '4.1.0',
        '4.2.0',
        '4.3.0',
        '4.4.0',
        '4.4.1',
    ]
}

all_package_specs = []

for package, versions in packages.iteritems():
    versions.reverse()
    package_specs = []
    all_package_specs.append(package_specs)
    for version in versions:
        package_specs.append('{}=={}'.format(package, version))


combinations = [s for s in itertools.product(*all_package_specs)]

print combinations
print ""
print "Number of combinations:"
print len(combinations)
print ""

for batch in combinations:
    for specs in batch:
        subprocess.call(['pip', 'install', specs])

    # test here if this combination of packages works or not
    if subprocess.call(['echo', 'test']):
        print('negatory')
    else:
        print('affirmative')
        print(batch)
        break