io.py 文件源码

def async_url_open(url, timeout=0, **kwargs):
    if url.startswith('http'):
        page = NamedTemporaryFile(delete=False)
        new_url = page.name
        yield downloadPage(encode(url), page, timeout=timeout)
    else:
        page, new_url = None, url

    f = yield async_get_file(new_url, StringTransport(), **kwargs)

    if page:
        page.close()
        remove(page.name)

    return_value(f)