To-do items toward a minimum viable product

[jpivarski]

• [x] replace assert False, "TODO" with raise NotImplementedError (the mypy constraint no longer exists).
• [x] creation functions arange (from NumPy/CuPy)
• [x] creation functions empty (from NumPy/CuPy)
• [x] creation functions eye (from NumPy/CuPy)
• [x] creation functions from_dlpack (from NumPy/CuPy)
• [x] creation functions full (from NumPy/CuPy)
• [x] creation functions linspace (from NumPy/CuPy)
• [x] creation functions ones (from NumPy/CuPy)
• [x] creation functions zeros (from NumPy/CuPy)
• [x] data type functions can_cast (from NumPy)
• [x] data type functions finfo (from NumPy)
• [x] data type functions iinfo (from NumPy)
• [x] data type functions result_type (from NumPy)
• [x] data type functions astype (from Awkward)
• [x] creation functions empty_like (from Awkward)
• [x] creation functions full_like (from Awkward)
• [x] creation functions ones_like (from Awkward)
• [x] creation functions zeros_like (from Awkward)
• [x] manipulation functions broadcast_arrays (from Awkward)
• [x] manipulation functions concat (from Awkward)
• [x] searching functions nonzero and where (from Awkward; the 1-arg and 3-arg cases)
• [x] array object __dlpack__ and __dlpack_device__ (only for rectilinear arrays)
• [x] array object __getitem__
• [x] array object __len__ (and declare it to be a Sequence or Sized or something)
• [x] array object __setitem__
• [x] array object __iter__
• [x] array object __init__'s copy argument should do a deepcopy
• [x] manipulation functions expand_dims (from a slice)
• [x] manipulation functions squeeze (from a slice)
• [x] indexing functions take (from a slice)

This would reduce our 51 TODOs down to 20 (by filling in 31).

[jpivarski]

Now

% fgrep -r 'NotImplementedError("TODO ' src | wc -l
33

The remaining 8 check-boxes should bring it down by 7, down to 26 TODOs. (The accounting changed when I converted assertions into NotImplementedError.)

[jpivarski]

Now

% fgrep -r 'NotImplementedError("TODO ' src | wc -l
23

Yes, I got rid of a few others along the way (arguments in ragged.array functions).

All the rest of the NotImplementedError TODOs are in issues. They'll be addressed one at a time, as needed.