[Numpy-discussion] Proposal: add ndarray.keys() to return dtype.names

[Stephan Hoyer]

I like this idea. But I am -1 on returning None if the array is
unstructured. I expect .keys(), if present, to always return an iterable.

In fact, this would break some of my existing code, which checks for the
existence of "keys" as a way to do duck typed checks for dictionary like
objects (e.g., including pandas.DataFrame):
https://github.com/xray/xray/blob/v0.3/xray/core/utils.py#L165
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