[Python-ideas] Consider making enumerate a sequence if its argument is a sequence

[Neil Girdhar]

What are the pros and cons of making enumerate a sequence if its argument 
is a sequence?

I found myself writing:

                for vertex, height in zip(
                        self.cache.height_to_vertex[height_slice],
                        range(height_slice.start, height_slice.stop)):

I would have preferred:

                for height, vertex in enumerate(
                        self.cache.height_to_vertex)[height_slice]:


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