[jira] [Created] (ARROW-5201) [Python] Import ABCs from collections is deprecated in Python 3.7

["Joris Van den Bossche (JIRA)" <ji...@apache.org>]

Joris Van den Bossche created ARROW-5201:
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             Summary: [Python] Import ABCs from collections is deprecated in Python 3.7
                 Key: ARROW-5201
                 URL: https://issues.apache.org/jira/browse/ARROW-5201
             Project: Apache Arrow
          Issue Type: Bug
          Components: Python
            Reporter: Joris Van den Bossche


From running the tests, I see a few deprecation warnings related to that on Python 3, abstract base classes should be imported from `collections.abc` instead of `collections`:

{code:none}
pyarrow/tests/test_array.py:808
  /home/joris/scipy/repos/arrow/python/pyarrow/tests/test_array.py:808: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated, and in 3.8 it will stop working
    pa.struct([pa.field('a', pa.int64()), pa.field('b', pa.string())]))

pyarrow/tests/test_table.py:18
  /home/joris/scipy/repos/arrow/python/pyarrow/tests/test_table.py:18: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated, and in 3.8 it will stop working
    from collections import OrderedDict, Iterable

pyarrow/tests/test_feather.py::TestFeatherReader::test_non_string_columns
  /home/joris/scipy/repos/arrow/python/pyarrow/pandas_compat.py:294: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated, and in 3.8 it will stop working
    elif isinstance(name, collections.Sequence):{code}

Those could be imported depending on python 2/3 in the ``pyarrow.compat`` module.



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