fix #85 : display dtype (in title)

[alixdamman]

• display shape + dtype of Numpy ndarray in title

No need to change Tooltip associated with listwidget. It uses array.info which will be changed in larray project (see PR larray-project/larray#459).

[gdementen]

I wonder if this case is even possible now that you explicitly handle np.ndarray.

[gdementen]

why not move the dtype thing outside this if statement:

if isinstance(array, LArray):
    ...
elif isinstance(array, np.ndarray):
   ...
else:
   ...

if isinstance(array, (LArray, np.ndarray)):
    title[-1] += ' [{}]'.format(array.dtype.name)

also anything we display in the viewer should have a shape (even if no .shape attribute), so you could refactor this into something like:

if isinstance(array, LArray):
    shape_parts = ["%s (%d)" % (display_name, len(axis)) for display_name, axis in zip(axes.display_names, axes)]
elif isinstance(array, np.ndarray):
    shape_parts = [str(l) for l in array.shape]
else:
    # unsure this is necessary, but we could add this case
    shape_parts = [str(len(array))]

array_info = ' x '.join(shape_parts)
if name:
   array_info = name + ': ' array_info
if isinstance(...):
    array_info += ' [{}]'.format(array.dtype.name)
full_title = ' - '.join([title_part for title_part in [fname, array_info, title] if title_part != ''])

BTW: I think that the unsaved_modification indicator would look better/be more standard if it was next to (just before) the filename, instead of at the end.

[gdementen]

adding an assert checking that assumption would probably be worth it in the long run, when we start displaying more stuff