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, 2 insertions, 2 deletions

diff --git a/numpy/testing/noseclasses.py b/numpy/testing/noseclasses.py
index 96c779c2e..f3c15b39d 100644
--- a/numpy/testing/noseclasses.py
+++ b/numpy/testing/noseclasses.py
@@ -4,7 +4,7 @@
 # Because this module imports nose directly, it should not
 # be used except by nosetester.py to avoid a general NumPy
 # dependency on nose.
-from __future__ import division
+from __future__ import division, absolute_import
 
 import os
 import doctest
@@ -15,7 +15,7 @@ from nose.plugins.errorclass import ErrorClass, ErrorClassPlugin
 from nose.plugins.base import Plugin
 from nose.util import src
 import numpy
-from nosetester import get_package_name
+from .nosetester import get_package_name
 import inspect
 
 # Some of the classes in this module begin with 'Numpy' to clearly distinguish