python37Packages.dateparser tests fail

[ivan]

Issue description

python36Packages.dateparser tests pass, while python37Packages.dateparser tests fail with:

======================================================================
FAIL: test_detection_24_es (tests.test_search.TestTranslateSearch)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/nix/store/5v7lfgvnwl87vp4x18w1bhp14s7sw12m-python3.7-parameterized-0.6.1/lib/python3.7/site-packages/parameterized/parameterized.py", line 392, in standalone_func
    return func(*(a + p.args), **p.kwargs)
  File "/build/dateparser/tests/test_search.py", line 619, in test_detection
    self.assertEqual(result, shortname)
AssertionError: 'eo' != 'es'
- eo
+ es


======================================================================
FAIL: test_search_and_parse_26_es (tests.test_search.TestTranslateSearch)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/nix/store/5v7lfgvnwl87vp4x18w1bhp14s7sw12m-python3.7-parameterized-0.6.1/lib/python3.7/site-packages/parameterized/parameterized.py", line 392, in standalone_func
    return func(*(a + p.args), **p.kwargs)
  File "/build/dateparser/dateparser/conf.py", line 81, in wrapper
    return f(*args, **kwargs)
  File "/build/dateparser/tests/test_search.py", line 413, in test_search_and_parse
    self.assertEqual(result, expected)
AssertionError: Lists differ: [('a', datetime.datetime(2000, 1, 1, 0, 0)),[479 chars] 0))] != [('de 1939', datetime.datetime(1939, 1, 1, 0[51 chars] 0))]

First differing element 0:
('a', datetime.datetime(2000, 1, 1, 0, 0))
('de 1939', datetime.datetime(1939, 1, 1, 0, 0))

First list contains 10 additional elements.
First extra element 2:
('a', datetime.datetime(2000, 1, 1, 0, 0))

Diff is 670 characters long. Set self.maxDiff to None to see it.

======================================================================
FAIL: test_search_date_string_31_es (tests.test_search.TestTranslateSearch)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/nix/store/5v7lfgvnwl87vp4x18w1bhp14s7sw12m-python3.7-parameterized-0.6.1/lib/python3.7/site-packages/parameterized/parameterized.py", line 392, in standalone_func
    return func(*(a + p.args), **p.kwargs)
  File "/build/dateparser/tests/test_search.py", line 210, in test_search_date_string
    self.assertEqual(result, datetime_string)
AssertionError: 'M' != 'Miércoles 31 Diciembre 2014'
- M
+ Miércoles 31 Diciembre 2014


----------------------------------------------------------------------
Ran 209 tests in 3.805s

FAILED (failures=3)

Official Hydra sees the same thing: https://hydra.nixos.org/eval/1497276?filter=dateparser&compare=1497263&full=

Upstream's tests pass on Python 3.7 with their Travis setup. (That is a build of a recent commit, but I still see the same failures after pointing src = at a checkout of https://github.com/scrapinghub/dateparser)

Does anyone have any ideas?

Steps to reproduce

With nixpkgs master, nix-env -iA python37Packages.dateparser

[dotlambda]

See scrapinghub/dateparser#489, scrapinghub/dateparser#490 and scrapinghub/dateparser#493.

[dotlambda]

As long as this problem remains, the best thing to do is using python36 for affected application. Switching to python36 should be done in commits that don't change anything else and that reference this issue in their commit message so that they can easily be reverted.
Simply skipping the tests does not make much sense since these are real incompatibilities.