2to3: Use absolute imports.

The new import `absolute_import` is added the `from __future__ import`
statement and The 2to3 `import` fixer is run to make the imports
compatible. There are several things that need to be dealt with to make
this work.

1) Files meant to be run as scripts run in a different environment than
files imported as part of a package, and so changes to those files need
to be skipped. The affected script files are:

    * all setup.py files
    * numpy/core/code_generators/generate_umath.py
    * numpy/core/code_generators/generate_numpy_api.py
    * numpy/core/code_generators/generate_ufunc_api.py

2) Some imported modules are not available as they are created during
the build process and consequently 2to3 is unable to handle them
correctly. Files that import those modules need a bit of extra work.
The affected files are:

    * core/__init__.py,
    * core/numeric.py,
    * core/_internal.py,
    * core/arrayprint.py,
    * core/fromnumeric.py,
    * numpy/__init__.py,
    * lib/npyio.py,
    * lib/function_base.py,
    * fft/fftpack.py,
    * random/__init__.py

Closes #3172

1 files changed, 6 insertions, 6 deletions

diff --git a/numpy/testing/nosetester.py b/numpy/testing/nosetester.py
index 7f1292cd8..326c36cac 100644
--- a/numpy/testing/nosetester.py
+++ b/numpy/testing/nosetester.py
@@ -4,7 +4,7 @@ Nose test running.
 This module implements ``test()`` and ``bench()`` functions for NumPy modules.
 
 """
-from __future__ import division
+from __future__ import division, absolute_import
 
 import os
 import sys
@@ -216,7 +216,7 @@ class NoseTester(object):
 
         A return value of None means use the nose builtin doctest plugin
         """
-        from noseclasses import NumpyDoctest
+        from .noseclasses import NumpyDoctest
         return NumpyDoctest()
 
     def prepare_test_args(self, label='fast', verbose=1, extra_argv=None,
@@ -245,7 +245,7 @@ class NoseTester(object):
                    '--cover-tests', '--cover-erase']
         # construct list of plugins
         import nose.plugins.builtin
-        from noseclasses import KnownFailure, Unplugger
+        from .noseclasses import KnownFailure, Unplugger
         plugins = [KnownFailure()]
         plugins += [p() for p in nose.plugins.builtin.plugins]
         # add doctesting if required
@@ -331,7 +331,7 @@ class NoseTester(object):
         # cap verbosity at 3 because nose becomes *very* verbose beyond that
         verbose = min(verbose, 3)
 
-        import utils
+        from . import utils
         utils.verbose = verbose
 
         if doctests:
@@ -371,7 +371,7 @@ class NoseTester(object):
         warnings.filterwarnings("ignore", message="numpy.ufunc size changed")
 
         try:
-            from noseclasses import NumpyTestProgram
+            from .noseclasses import NumpyTestProgram
 
             argv, plugins = self.prepare_test_args(label,
                     verbose, extra_argv, doctests, coverage)
@@ -447,7 +447,7 @@ class NoseTester(object):
         nose = import_nose()
 
         # get plugin to disable doctests
-        from noseclasses import Unplugger
+        from .noseclasses import Unplugger
         add_plugins = [Unplugger('doctest')]
 
         return nose.run(argv=argv, addplugins=add_plugins)