***UNCHECKED*** [jira] [Created] (ARROW-3269) [Python] Fix warnings in unit test suite

["Wes McKinney (JIRA)" <ji...@apache.org>]

Wes McKinney created ARROW-3269:
-----------------------------------

             Summary: [Python] Fix warnings in unit test suite
                 Key: ARROW-3269
                 URL: https://issues.apache.org/jira/browse/ARROW-3269
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Python
            Reporter: Wes McKinney
             Fix For: 0.11.0


Observed in recent appveyor build https://ci.appveyor.com/project/pitrou/arrow/build/job/c6b3pslhqag1gnw7

{code}
============================== warnings summary ===============================
<unknown>:1396: DeprecationWarning: invalid escape sequence \(
<unknown>:1401: DeprecationWarning: invalid escape sequence \(
c:\miniconda36-x64\envs\wheel_test\lib\site-packages\pyarrow\formatting.py:32: FutureWarning: array_format is deprecated, use Array.format() instead
  FutureWarning)
c:\miniconda36-x64\envs\wheel_test\lib\site-packages\pyarrow\formatting.py:32: FutureWarning: array_format is deprecated, use Array.format() instead
  FutureWarning)
c:\miniconda36-x64\envs\wheel_test\lib\site-packages\pyarrow\formatting.py:32: FutureWarning: array_format is deprecated, use Array.format() instead
  FutureWarning)
c:\miniconda36-x64\envs\wheel_test\lib\site-packages\pandas\core\dtypes\missing.py:431: DeprecationWarning: The truth value of an empty array is ambiguous. Returning False, but in future this will result in an error. Use `array.size > 0` to check that an array is not empty.
  if left_value != right_value:
c:\miniconda36-x64\envs\wheel_test\lib\site-packages\pandas\core\dtypes\missing.py:431: DeprecationWarning: The truth value of an empty array is ambiguous. Returning False, but in future this will result in an error. Use `array.size > 0` to check that an array is not empty.
  if left_value != right_value:
c:\miniconda36-x64\envs\wheel_test\lib\site-packages\pandas\core\dtypes\missing.py:431: DeprecationWarning: The truth value of an empty array is ambiguous. Returning False, but in future this will result in an error. Use `array.size > 0` to check that an array is not empty.
  if left_value != right_value:
source:1396: DeprecationWarning: invalid escape sequence \(
source:1401: DeprecationWarning: invalid escape sequence \(
c:\miniconda36-x64\envs\wheel_test\lib\site-packages\pandas\core\dtypes\missing.py:431: FutureWarning: In the future, NAT != NAT will be True rather than False.
  if left_value != right_value:
c:\miniconda36-x64\envs\wheel_test\lib\site-packages\pandas\core\dtypes\missing.py:431: DeprecationWarning: The truth value of an empty array is ambiguous. Returning False, but in future this will result in an error. Use `array.size > 0` to check that an array is not empty.
  if left_value != right_value:
c:\miniconda36-x64\envs\wheel_test\lib\site-packages\pandas\core\dtypes\missing.py:431: DeprecationWarning: elementwise != comparison failed; this will raise an error in the future.
  if left_value != right_value:
c:\miniconda36-x64\envs\wheel_test\lib\site-packages\pandas\core\dtypes\missing.py:431: DeprecationWarning: The truth value of an empty array is ambiguous. Returning False, but in future this will result in an error. Use `array.size > 0` to check that an array is not empty.
  if left_value != right_value:
c:\miniconda36-x64\envs\wheel_test\lib\site-packages\pandas\core\dtypes\missing.py:431: DeprecationWarning: The truth value of an empty array is ambiguous. Returning False, but in future this will result in an error. Use `array.size > 0` to check that an array is not empty.
  if left_value != right_value:
c:\miniconda36-x64\envs\wheel_test\lib\site-packages\pandas\core\dtypes\missing.py:431: DeprecationWarning: The truth value of an empty array is ambiguous. Returning False, but in future this will result in an error. Use `array.size > 0` to check that an array is not empty.
  if left_value != right_value:
c:\miniconda36-x64\envs\wheel_test\lib\site-packages\pyarrow\tests\test_convert_pandas.py:2076: RuntimeWarning: invalid value encountered in sqrt
  _check_series(pd.Series([np.sqrt(-1)] * 3, dtype=object))
c:\miniconda36-x64\envs\wheel_test\lib\site-packages\pandas\core\dtypes\missing.py:431: DeprecationWarning: The truth value of an empty array is ambiguous. Returning False, but in future this will result in an error. Use `array.size > 0` to check that an array is not empty.
  if left_value != right_value:
c:\miniconda36-x64\envs\wheel_test\lib\site-packages\pandas\core\dtypes\missing.py:431: DeprecationWarning: The truth value of an empty array is ambiguous. Returning False, but in future this will result in an error. Use `array.size > 0` to check that an array is not empty.
  if left_value != right_value:
c:\miniconda36-x64\envs\wheel_test\lib\site-packages\pyarrow\tests\test_ipc.py:298: FutureWarning: Please use read_next_batch instead of get_next_batch
  reader.get_next_batch()
c:\miniconda36-x64\envs\wheel_test\lib\site-packages\pandas\core\dtypes\missing.py:431: DeprecationWarning: The truth value of an empty array is ambiguous. Returning False, but in future this will result in an error. Use `array.size > 0` to check that an array is not empty.
  if left_value != right_value:
c:\miniconda36-x64\envs\wheel_test\lib\site-packages\pandas\core\dtypes\missing.py:431: DeprecationWarning: The truth value of an empty array is ambiguous. Returning False, but in future this will result in an error. Use `array.size > 0` to check that an array is not empty.
  if left_value != right_value:
c:\miniconda36-x64\envs\wheel_test\lib\site-packages\pandas\core\dtypes\missing.py:431: DeprecationWarning: The truth value of an empty array is ambiguous. Returning False, but in future this will result in an error. Use `array.size > 0` to check that an array is not empty.
  if left_value != right_value:
c:\miniconda36-x64\envs\wheel_test\lib\site-packages\pandas\core\dtypes\missing.py:431: DeprecationWarning: The truth value of an empty array is ambiguous. Returning False, but in future this will result in an error. Use `array.size > 0` to check that an array is not empty.
  if left_value != right_value:
c:\miniconda36-x64\envs\wheel_test\lib\site-packages\pandas\core\dtypes\missing.py:431: FutureWarning: In the future, NAT != NAT will be True rather than False.
  if left_value != right_value:
c:\miniconda36-x64\envs\wheel_test\lib\site-packages\pandas\core\dtypes\missing.py:431: FutureWarning: In the future, NAT != NAT will be True rather than False.
  if left_value != right_value:
c:\miniconda36-x64\envs\wheel_test\lib\site-packages\pandas\core\dtypes\missing.py:431: DeprecationWarning: The truth value of an empty array is ambiguous. Returning False, but in future this will result in an error. Use `array.size > 0` to check that an array is not empty.
  if left_value != right_value:
c:\miniconda36-x64\envs\wheel_test\lib\site-packages\pandas\core\dtypes\missing.py:431: DeprecationWarning: The truth value of an empty array is ambiguous. Returning False, but in future this will result in an error. Use `array.size > 0` to check that an array is not empty.
  if left_value != right_value:
c:\miniconda36-x64\envs\wheel_test\lib\site-packages\pyarrow\tests\test_parquet.py:1526: FutureWarning: Comparing Series of datetimes with 'datetime.date'.  Currently, the
'datetime.date' is coerced to a datetime. In the future pandas will
not coerce, and 'the values will not compare equal to the
'datetime.date'. To retain the current behavior, convert the
'datetime.date' to a datetime with 'pd.Timestamp'.
  predicate &= df[name] == value
c:\miniconda36-x64\envs\wheel_test\lib\site-packages\pyarrow\tests\test_parquet.py:1974: ParserWarning: Falling back to the 'python' engine because the 'c' engine does not support regex separators (separators > 1 char and different from '\s+' are interpreted as regex); you can avoid this warning by specifying engine='python'.
  io.BytesIO(expected_string), sep=r'\s{2,}', index_col=None, header=0
c:\miniconda36-x64\envs\wheel_test\lib\site-packages\pyarrow\tests\test_parquet.py:1996: ParserWarning: Falling back to the 'python' engine because the 'c' engine does not support regex separators (separators > 1 char and different from '\s+' are interpreted as regex); you can avoid this warning by specifying engine='python'.
  sep=r'\s{2,}', index_col=['cut', 'color', 'clarity'], header=0
c:\miniconda36-x64\envs\wheel_test\lib\site-packages\pyarrow\tests\test_parquet.py:2019: ParserWarning: Falling back to the 'python' engine because the 'c' engine does not support regex separators (separators > 1 char and different from '\s+' are interpreted as regex); you can avoid this warning by specifying engine='python'.
  sep=r'\s{2,}', index_col=['cut', 'color', 'clarity'], header=0
-- Docs: https://docs.pytest.org/en/latest/warnings.html
====== 1003 passed, 93 skipped, 5 xfailed, 32 warnings in 19.77 seconds =======
(wheel_test) C:\projects\arrow>set lastexitcode=0 
{code}



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