setup.py 文件源码

def get_pypi_src_download(package):
        url = 'https://pypi.python.org/pypi/%s/json'%(package,)
        fp = urllib.urlopen(url)
        try:
            try:
                data = fp.read()

            finally:
                fp.close()
        except urllib.error:
            raise RuntimeError("Cannot determine download link for %s"%(package,))

        pkgdata = json.loads(data.decode('utf-8'))
        if 'urls' not in pkgdata:
            raise RuntimeError("Cannot determine download link for %s"%(package,))

        for info in pkgdata['urls']:
            if info['packagetype'] == 'sdist' and info['url'].endswith('tar.gz'):
                return (info.get('md5_digest'), info['url'])

        raise RuntimeError("Cannot determine downlink link for %s"%(package,))