Quick script to determine if a set of Python packages work with Python 3

py3-ready

#!/usr/bin/env python

## Accepts a list of packages on stdin and prints whether each
## package is compatible with Python 3. The easiest way to
## use this script is by piping the output of `pip freeze`
## into it:
##
##   $ pip freeze | py3-ready
##
##
## Author: Michael Dippery <michael@monkey-robot.com>

import requests
import json
import sys
from termcolor import colored


def pypi_url(package, version=None):
    url = "https://pypi.python.org/pypi/%s/" % package
    if version:
        url = url + version + "/"
    url += "json"
    return url


def is_pypi_package(p):
    forbidden_prefixes = ["-e", "## !!"]
    for prefix in forbidden_prefixes:
        if p.startswith(prefix):
            return False
    resp = requests.head(pypi_url(p))
    return resp.status_code == requests.codes.ok


def is_py3_compatible(package, version=None):
    url = pypi_url(package, version)
    resp = requests.get(url)
    if resp.status_code != requests.codes.ok:
        print >>sys.stderr, "Could not find data for %s %s" % (package, "v" + version if version else "")
        return False
    data = resp.json()
    for classifier in data['info']['classifiers']:
        if classifier.startswith("Programming Language :: Python :: 3"):
            return True
    return False


def main():
    for package_line in sys.stdin.readlines():
        package_line = package_line.strip()
        package_data = package_line.split("==")
        package, version = None, None
        if len(package_data) == 2:
            if is_pypi_package(package_data[0]):
                package, version = package_data
        elif len(package_data) == 1:
            if is_pypi_package(package_data[0]):
                package = package_data[0]
        if package:
            if is_py3_compatible(package, version):
                label = "is"
                color = 'green'
            else:
                label = "is NOT"
                color = 'red'
            status = "%s %s Python 3-compatible" % (package, label)
            status = colored(status, color)
            print status
        else:
            print >>sys.stderr, "Invalid package: %s" % package_data
    return 0


if __name__ == "__main__":
    sys.exit(main())