axes.py 文件源码

def _reduce_nested(elem, agg, func):
    """
    Reduces a nested sequence by applying a function to each
    of its elements and returns an aggregation.

    Arguments:
      elem: The object to be reduced, either a sequence
        or a singleton.
      agg: A variable holding information collected
        as the sequence is collapsed.
      func: A function to augment the aggregate by processing
        a singleton. Should have the form func(agg, elem) -> agg

    Returns:
        agg: The final aggregate returned by the function.
    """
    if isinstance(elem, collections.Iterable):
        for sub in elem:
            agg = _reduce_nested(sub, agg, func)
        return agg
    else:
        return func(agg, elem)