_url.py 文件源码

def iter_pairs(iterable):
    """
    Iterate over the (key, value) pairs in ``iterable``.

    This handles dictionaries sensibly, and falls back to assuming the
    iterable yields (key, value) pairs. This behaviour is similar to
    what Python's ``dict()`` constructor does.
    """
    if isinstance(iterable, Mapping):
        iterable = iterable.items()
    return iter(iterable)