Some classes, such as Series in pandas produce instances that can be called by numpy.array and turned into numpy arrays.
How do I make instances of a class that I'm writing (which works with a few arrays at the core) be allowed to be passed as argument to numpy.array and converted to a numpy array?
(perhaps "callable" is not the right word)
It looks like one easy way is to make the object define an __array__(self) method that returns the array you want numpy.array to return.
You can also make your object a sequence: define __iter__(self) to return an iterator over all the items, __getitem__(self, i), to return the ith element, and and __len__(self) to return the length.
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