# Usage:
# Windows: type package_list.txt | python validate_packages.py > valid_packages.txt
# Linux/Mac: cat package_list.txt | python validate_packages.py > valid_packages.txt

import json
import sys
import urllib
import urllib.request as url_lib


def _get_pypi_package_data(package_name):
    json_uri = "https://pypi.org/pypi/{0}/json".format(package_name)
    # Response format: https://warehouse.readthedocs.io/api-reference/json/#project
    # Release metadata format: https://github.com/pypa/interoperability-peps/blob/master/pep-0426-core-metadata.rst
    with url_lib.urlopen(json_uri) as response:
        return json.loads(response.read())


def validate_package(package):
    try:
        data = _get_pypi_package_data(package)
        num_versions = len(data["releases"])
        return num_versions > 1
    except urllib.error.HTTPError:
        return False


if __name__ == "__main__":
    packages = sys.stdin.read().splitlines()
    valid_packages = []
    for pkg in packages:
        if validate_package(pkg):
            print(pkg)
            valid_packages.append(pkg)