This was a vestige from when we used to need the unittest2 library for pre-2.7
compatibility. Now that we require Python 2.7, we aren't using that library
and this indirection wasn't doing any good.
This reverts commit 9c41c39913.
That commit used byte strings for the `if __name__ == '__main__'` pattern,
which was necessary when we were doing unicode_literals. But it is wrong on
Python 3, and now that we're liberated from unicode_literals, we need to go
back to native strings for this comparison.
Include import of __future__ features division, absolute_imports and
print_function everywhere. Don't add unicode_literals yet for it is
harder to convert.
Goal is smoothing the transition to python 3.
matches all letters starting with A to D (upper and lower case). This
change allows to put more artists into that bucket. E.g. artists
starting with ä or Ä and 0 to 9 and … (three dots)
Example config for overriding a bucket pattern:
bucket:
bucket_alpha: ['A - D', 'E - L', 'M - R', 'S - Z']
bucket_alpha_regex:
'A - D': ^[0-9a-dA-D…äÄ]
- spans are now tracked via a list of dicts instead of 2 lists
previously (simpler code)
- extend_year_spans() pregenerates all possible ranges at plugin setup
stage
- a BucketError is now raised if declared bucket format not accepted
