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 numpy#3172

doc/cdoc/numpyfilter.py

@@ -6,7 +6,7 @@
 Also, add Doxygen /** and /**< syntax automatically where appropriate.
 
 """
-from __future__ import division
+from __future__ import division, absolute_import
 
 import sys
 import re

doc/cython/run_test.py

@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import division
+from __future__ import division, absolute_import
 
 from numpyx import test
 test()

doc/example.py

@@ -8,7 +8,7 @@
 a line by itself, preferably preceeded by a blank line.
 
 """
-from __future__ import division
+from __future__ import division, absolute_import
 
 import os # standard library imports first
 

doc/newdtype_example/example.py

@@ -1,4 +1,4 @@
-from __future__ import division
+from __future__ import division, absolute_import
 
 import floatint.floatint as ff
 import numpy as np

doc/newdtype_example/floatint/__init__.py

@@ -1,3 +1,3 @@
-from __future__ import division
+from __future__ import division, absolute_import
 
 

doc/numpybook/comparison/ctypes/filter.py

@@ -1,4 +1,4 @@
-from __future__ import division
+from __future__ import division, absolute_import
 
 __all__ = ['filter2d']
 

doc/numpybook/comparison/ctypes/interface.py

@@ -1,4 +1,4 @@
-from __future__ import division
+from __future__ import division, absolute_import
 
 __all__ = ['add', 'filter2d']
 

doc/numpybook/comparison/timing.py

@@ -1,4 +1,4 @@
-from __future__ import division
+from __future__ import division, absolute_import
 
 import timeit
 

doc/numpybook/comparison/weave/filter.py

@@ -1,4 +1,4 @@
-from __future__ import division
+from __future__ import division, absolute_import
 
 from scipy import weave, zeros_like
 

doc/numpybook/comparison/weave/inline.py

@@ -1,4 +1,4 @@
-from __future__ import division
+from __future__ import division, absolute_import
 
 from scipy import weave
 from numpy import rand, zeros_like

doc/numpybook/runcode.py

@@ -14,7 +14,7 @@
   -n name of code section  (default MyCode)
 
 """
-from __future__ import division
+from __future__ import division, absolute_import
 
 import sys
 import optparse

doc/postprocess.py

@@ -6,7 +6,7 @@
 MODE is either 'html' or 'tex'.
 
 """
-from __future__ import division
+from __future__ import division, absolute_import
 
 import re, optparse
 

doc/pyrex/run_test.py

@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import division
+from __future__ import division, absolute_import
 
 from numpyx import test
 test()

doc/source/conf.py

@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import division
+from __future__ import division, absolute_import
 
 import sys, os, re
 

doc/sphinxext/numpydoc/comment_eater.py

@@ -1,4 +1,4 @@
-from __future__ import division
+from __future__ import division, absolute_import
 
 import sys
 if sys.version_info[0] >= 3:

doc/sphinxext/numpydoc/compiler_unparse.py

@@ -10,7 +10,7 @@
     fixme: We may want to move to using _ast trees because the compiler for
            them is about 6 times faster than compiler.compile.
 """
-from __future__ import division
+from __future__ import division, absolute_import
 
 import sys
 from compiler.ast import Const, Name, Tuple, Div, Mul, Sub, Add

doc/sphinxext/numpydoc/docscrape.py

@@ -1,7 +1,7 @@
 """Extract reference documentation from the NumPy source tree.
 
 """
-from __future__ import division
+from __future__ import division, absolute_import
 
 import sys
 import inspect

doc/sphinxext/numpydoc/docscrape_sphinx.py

@@ -1,4 +1,4 @@
-from __future__ import division
+from __future__ import division, absolute_import
 
 import re, inspect, textwrap, pydoc
 import sphinx

doc/sphinxext/numpydoc/linkcode.py

@@ -9,7 +9,7 @@
     :license: BSD, see LICENSE for details.
 
 """
-from __future__ import division
+from __future__ import division, absolute_import
 
 import warnings
 import collections

doc/sphinxext/numpydoc/numpydoc.py

@@ -15,7 +15,7 @@
 .. [1] https://github.com/numpy/numpy/blob/master/doc/HOWTO_DOCUMENT.rst.txt
 
 """
-from __future__ import division
+from __future__ import division, absolute_import
 
 import sphinx
 import collections

doc/sphinxext/numpydoc/phantom_import.py

@@ -14,7 +14,7 @@
 .. [1] http://code.google.com/p/pydocweb
 
 """
-from __future__ import division
+from __future__ import division, absolute_import
 
 import imp, sys, compiler, types, os, inspect, re
 

doc/sphinxext/numpydoc/plot_directive.py

@@ -74,7 +74,7 @@
   to make them appear side-by-side, or in floats.
 
 """
-from __future__ import division
+from __future__ import division, absolute_import
 
 import sys, os, glob, shutil, imp, warnings, re, textwrap, traceback
 import sphinx

doc/sphinxext/numpydoc/tests/test_docscrape.py

@@ -1,5 +1,5 @@
 # -*- encoding:utf-8 -*-
-from __future__ import division
+from __future__ import division, absolute_import
 
 import sys, textwrap
 

doc/sphinxext/numpydoc/traitsdoc.py

@@ -13,7 +13,7 @@
 .. [2] http://code.enthought.com/projects/traits/
 
 """
-from __future__ import division
+from __future__ import division, absolute_import
 
 import inspect
 import os

doc/summarize.py

@@ -5,7 +5,7 @@
 Show a summary about which Numpy functions are documented and which are not.
 
 """
-from __future__ import division
+from __future__ import division, absolute_import
 
 import os, glob, re, sys, inspect, optparse
 import collections

doc/swig/test/testArray.py

@@ -1,5 +1,5 @@
 #! /usr/bin/env python
-from __future__ import division
+from __future__ import division, absolute_import
 
 # System imports
 from   distutils.util import get_platform

doc/swig/test/testFarray.py

@@ -1,5 +1,5 @@
 #! /usr/bin/env python
-from __future__ import division
+from __future__ import division, absolute_import
 
 # System imports
 from   distutils.util import get_platform

doc/swig/test/testFortran.py

@@ -1,5 +1,5 @@
 #! /usr/bin/env python
-from __future__ import division
+from __future__ import division, absolute_import
 
 # System imports
 from   distutils.util import get_platform

doc/swig/test/testMatrix.py

@@ -1,5 +1,5 @@
 #! /usr/bin/env python
-from __future__ import division
+from __future__ import division, absolute_import
 
 # System imports
 from   distutils.util import get_platform

doc/swig/test/testTensor.py

@@ -1,5 +1,5 @@
 #! /usr/bin/env python
-from __future__ import division
+from __future__ import division, absolute_import
 
 # System imports
 from   distutils.util import get_platform

doc/swig/test/testVector.py

@@ -1,5 +1,5 @@
 #! /usr/bin/env python
-from __future__ import division
+from __future__ import division, absolute_import
 
 # System imports
 from   distutils.util import get_platform

numpy/__init__.py

@@ -104,7 +104,7 @@
 Exceptions to this rule are documented.
 
 """
-from __future__ import division
+from __future__ import division, absolute_import
 
 # We first need to detect if we're being called as part of the numpy setup
 # procedure itself in a reliable manner.
@@ -126,43 +126,43 @@
         its source directory; please exit the numpy source tree, and relaunch
         your python intepreter from there."""
         raise ImportError(msg)
-    from version import git_revision as __git_revision__
-    from version import version as __version__
+    from .version import git_revision as __git_revision__
+    from .version import version as __version__
 
-    from _import_tools import PackageLoader
+    from ._import_tools import PackageLoader
 
     def pkgload(*packages, **options):
         loader = PackageLoader(infunc=True)
         return loader(*packages, **options)
 
-    import add_newdocs
+    from . import add_newdocs
     __all__ = ['add_newdocs']
 
     pkgload.__doc__ = PackageLoader.__call__.__doc__
 
-    from testing import Tester
+    from .testing import Tester
     test = Tester().test
     bench = Tester().bench
 
-    import core
-    from core import *
-    import compat
-    import lib
-    from lib import *
-    import linalg
-    import fft
-    import polynomial
-    import random
-    import ctypeslib
-    import ma
-    import matrixlib as _mat
-    from matrixlib import *
+    from . import core
+    from .core import *
+    from . import compat
+    from . import lib
+    from .lib import *
+    from . import linalg
+    from . import fft
+    from . import polynomial
+    from . import random
+    from . import ctypeslib
+    from . import ma
+    from . import matrixlib as _mat
+    from .matrixlib import *
 
     # Make these accessible from numpy name-space
     #  but not imported in from numpy import *
     from __builtin__ import bool, int, long, float, complex, \
          object, unicode, str
-    from core import round, abs, max, min
+    from .core import round, abs, max, min
 
     __all__.extend(['__version__', 'pkgload', 'PackageLoader',
                'show_config'])

numpy/_import_tools.py

@@ -1,4 +1,4 @@
-from __future__ import division
+from __future__ import division, absolute_import
 
 import os
 import sys

numpy/add_newdocs.py

@@ -8,7 +8,7 @@
       core/fromnumeric.py, core/defmatrix.py up-to-date.
 
 """
-from __future__ import division
+from __future__ import division, absolute_import
 
 from numpy.lib import add_newdoc
 

numpy/build_utils/__init__.py

@@ -1 +1 @@
-from __future__ import division
+from __future__ import division, absolute_import

numpy/build_utils/common.py

@@ -1,4 +1,4 @@
-from __future__ import division
+from __future__ import division, absolute_import
 
 import sys
 import copy

numpy/build_utils/waf.py

@@ -1,4 +1,4 @@
-from __future__ import division
+from __future__ import division, absolute_import
 
 import os
 import re
@@ -7,7 +7,7 @@
 import waflib.Tools.c_config
 from waflib import Logs, Utils
 
-from common \
+from .common \
     import \
         LONG_DOUBLE_REPRESENTATION_SRC, pyod, \
         long_double_representation

numpy/compat/__init__.py

@@ -8,12 +8,12 @@
   * we may only need a small subset of the copied library/module
 
 """
-from __future__ import division
+from __future__ import division, absolute_import
 
-import _inspect
-import py3k
-from _inspect import getargspec, formatargspec
-from py3k import *
+from . import _inspect
+from . import py3k
+from ._inspect import getargspec, formatargspec
+from .py3k import *
 
 __all__ = []
 __all__.extend(_inspect.__all__)

numpy/compat/_inspect.py

@@ -5,7 +5,7 @@
 no overhead.
 
 """
-from __future__ import division
+from __future__ import division, absolute_import
 
 import types
 

numpy/compat/py3k.py

@@ -2,7 +2,7 @@
 Python 3 compatibility tools.
 
 """
-from __future__ import division
+from __future__ import division, absolute_import
 
 __all__ = ['bytes', 'asbytes', 'isfileobj', 'getexception', 'strchar',
            'unicode', 'asunicode', 'asbytes_nested', 'asunicode_nested',