Python urllib.request 模块，FancyURLopener() 实例源码

def urlopen(url, data=None, proxies=None):
    """urlopen(url [, data]) -> open file-like object"""
    global _urlopener
    if proxies is not None:
        opener = urllib_request.FancyURLopener(proxies=proxies)
    elif not _urlopener:
        with support.check_warnings(
                ('FancyURLopener style of invoking requests is deprecated.',
                DeprecationWarning)):
            opener = urllib_request.FancyURLopener()
        _urlopener = opener
    else:
        opener = _urlopener
    if data is None:
        return opener.open(url)
    else:
        return opener.open(url, data)

def __init__(self):
        super(FancyURLopener, self).__init__()