ENH: Show subclass type in dtype repr and str of structured arrays

This is a modification to the dtype str and repr functions what helps
solve https://github.com/numpy/numpy/issues/3581.

I discussed it on the mailing list in a message "Re: structured arrays,
recarrays, and record arrays" on Jan 19 2015. I didn't get any replies,
but hopefully that merely means "no opinion" rather than "bad idea".

What it does: For structured arrays, if the dtype is not np.void then
print the dtype as `(base_dtype, dtype)`.

New Behavior:

 >>> a = np.array([(1,'ABC'), (2, "DEF")], dtype=[('foo', int), ('bar', 'S4')])
 >>> np.rec.array(a)
 rec.array([(1, 'ABC'), (2, 'DEF')],
       dtype=(numpy.record, [('foo', '<i8'), ('bar', 'S4')]))
 >>> a.view(np.recarray)
 rec.array([(1, 'ABC'), (2, 'DEF')],
       dtype=[('foo', '<i8'), ('bar', 'S4')])

0 files changed, 0 insertions, 0 deletions