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A proposal for implementing some date/time types in NumPy

# Structured array extensions

1. Create with-style context that makes “named-columns” available as names in the namespace.

> with np.columns(array):
>   price = unit * quantityt

2. Allow structured arrays to be sliced by their column (i.e. one additional indexing option for structured arrays) so that a[:4, ‘foo’:’bar’] would be allowed.