[jira] [Created] (ARROW-230) Python: Do not name modules like native ones (i.e. rename pyarrow.io)

["Uwe L. Korn (JIRA)" <ji...@apache.org>]

Uwe L. Korn created ARROW-230:
---------------------------------

             Summary: Python: Do not name modules like native ones (i.e. rename pyarrow.io)
                 Key: ARROW-230
                 URL: https://issues.apache.org/jira/browse/ARROW-230
             Project: Apache Arrow
          Issue Type: Bug
          Components: Python
            Reporter: Uwe L. Korn


Although you can rename it in imports, still weird stuff can happen.

E.g. if you re-run make in the build directory (only happens probably if you change pyarrow's CMakeLists.txt and do not call it via setup.py) you will get the following error:

{noformat}
    -- Found Python lib /usr/lib/x86_64-linux-gnu/libpython2.7.so
    CMake Error at cmake_modules/FindNumPy.cmake:62 (message):
      NumPy import failure:

      Traceback (most recent call last):

        File "<string>", line 1, in <module>
        File "/home/uwe/.virtualenvs/pyarrow/local/lib/python2.7/site-packages/numpy/__init__.py", line 180, in <module>
          from . import add_newdocs
        File "/home/uwe/.virtualenvs/pyarrow/local/lib/python2.7/site-packages/numpy/add_newdocs.py", line 13, in <module>
          from numpy.lib import add_newdoc
        File "/home/uwe/.virtualenvs/pyarrow/local/lib/python2.7/site-packages/numpy/lib/__init__.py", line 8, in <module>
          from .type_check import *
        File "/home/uwe/.virtualenvs/pyarrow/local/lib/python2.7/site-packages/numpy/lib/type_check.py", line 11, in <module>
          import numpy.core.numeric as _nx
        File "/home/uwe/.virtualenvs/pyarrow/local/lib/python2.7/site-packages/numpy/core/__init__.py", line 58, in <module>
          from numpy.testing import Tester
        File "/home/uwe/.virtualenvs/pyarrow/local/lib/python2.7/site-packages/numpy/testing/__init__.py", line 14, in <module>
          from .utils import *
        File "/home/uwe/.virtualenvs/pyarrow/local/lib/python2.7/site-packages/numpy/testing/utils.py", line 15, in <module>
          from tempfile import mkdtemp
        File "/usr/lib/python2.7/tempfile.py", line 32, in <module>
          import io as _io

      ImportError:
      /home/uwe/Development/arrow/python/build/temp.linux-x86_64-2.7/./libpyarrow.so:
      undefined symbol: pyarrow_ARRAY_API

    Call Stack (most recent call first):
      CMakeLists.txt:223 (find_package)
{noformat}

The actual error message here is confusing but the basic problem is that here the wrong io module is imported. 



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