req_install.py 文件源码

def _build_req_from_url(url):

    parts = [p for p in url.split('#', 1)[0].split('/') if p]

    req = None
    if len(parts) > 2 and parts[-2] in ('tags', 'branches', 'tag', 'branch'):
        req = parts[-3]
    elif len(parts) > 1 and parts[-1] == 'trunk':
        req = parts[-2]
    if req:
        warnings.warn(
            'Sniffing the requirement name from the url is deprecated and '
            'will be removed in the future. Please specify an #egg segment '
            'instead.', RemovedInPip9Warning,
            stacklevel=2)
    return req