rework imports; tweak domain comparisons

nifty5/compat.py

+from __future__ import absolute_import, division, print_function
+from builtins import (ascii, bytes, chr, dict, filter, hex, input,
+                      map, next, oct, open, pow, range, round,
+                      super, zip)
+from functools import reduce

nifty5/data_objects/distributed_do.py

@@ -16,9 +16,8 @@
 # NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik
 # and financially supported by the Studienstiftung des deutschen Volkes.
 
-from __future__ import (absolute_import, division, print_function)
-from builtins import *
-from functools import reduce
+from __future__ import absolute_import, division, print_function
+from ..compat import *
 import numpy as np
 from .random import Random
 from mpi4py import MPI

nifty5/data_objects/random.py

@@ -16,7 +16,8 @@
 # NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik
 # and financially supported by the Studienstiftung des deutschen Volkes.
 
-from builtins import object
+from __future__ import absolute_import, division, print_function
+from ..compat import *
 import numpy as np
 
 

nifty5/domain_tuple.py

@@ -16,9 +16,8 @@
 # NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik
 # and financially supported by the Studienstiftung des deutschen Volkes.
 
-from __future__ import (absolute_import, division, print_function)
-from builtins import *
-from functools import reduce
+from __future__ import absolute_import, division, print_function
+from .compat import *
 from .domains.domain import Domain
 
 
@@ -138,8 +137,7 @@ class DomainTuple(object):
     def __eq__(self, x):
         if self is x:
             return True
-        x = DomainTuple.make(x)
-        return self is x
+        return self is DomainTuple.make(x)
 
     def __ne__(self, x):
         return not self.__eq__(x)

nifty5/domains/log_rg_space.py

-from functools import reduce
+from __future__ import absolute_import, division, print_function
+from ..compat import *
 from ..sugar import exp
-
 import numpy as np
-
 from .. import dobj
 from ..field import Field
 from .structured_domain import StructuredDomain

nifty5/domains/rg_space.py

@@ -16,9 +16,8 @@
 # NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik
 # and financially supported by the Studienstiftung des deutschen Volkes.
 
-from __future__ import division
-from builtins import range
-from functools import reduce
+from __future__ import absolute_import, division, print_function
+from ..compat import *
 import numpy as np
 from .structured_domain import StructuredDomain
 from ..field import Field

nifty5/domains/unstructured_domain.py

@@ -16,8 +16,9 @@
 # NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik
 # and financially supported by the Studienstiftung des deutschen Volkes.
 
+from __future__ import absolute_import, division, print_function
+from ..compat import *
 from .domain import Domain
-from functools import reduce
 
 
 class UnstructuredDomain(Domain):

nifty5/energies/kl.py

-from builtins import *
+from __future__ import absolute_import, division, print_function
+from ..compat import *
 from ..minimization.energy import Energy
 from ..utilities import memo, my_sum
 

nifty5/extra/energy_and_model_tests.py

@@ -16,8 +16,8 @@
 # NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik
 # and financially supported by the Studienstiftung des deutschen Volkes.
 
-from __future__ import (absolute_import, division, print_function)
-from builtins import *
+from __future__ import absolute_import, division, print_function
+from ..compat import *
 import numpy as np
 from ..sugar import from_random
 from ..minimization.energy import Energy

nifty5/field.py

@@ -16,12 +16,11 @@
 # NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik
 # and financially supported by the Studienstiftung des deutschen Volkes.
 
-from __future__ import (absolute_import, division, print_function)
-from builtins import *
+from __future__ import absolute_import, division, print_function
+from .compat import *
 import numpy as np
 from . import utilities
 from .domain_tuple import DomainTuple
-from functools import reduce
 from . import dobj
 
 
@@ -338,7 +337,7 @@ class Field(object):
             raise TypeError("The dot-partner must be an instance of " +
                             "the NIFTy field class")
 
-        if x._domain != self._domain:
+        if x._domain is not self._domain:
             raise ValueError("Domain mismatch")
 
         ndom = len(self._domain)
@@ -603,7 +602,7 @@ class Field(object):
             return True
         if not isinstance(other, Field):
             return False
-        if self._domain != other._domain:
+        if self._domain is not other._domain:
             return False
         return (self._val == other._val).all()
 
@@ -625,7 +624,7 @@ for op in ["__add__", "__radd__",
         def func2(self, other):
             # if other is a field, make sure that the domains match
             if isinstance(other, Field):
-                if other._domain != self._domain:
+                if other._domain is not self._domain:
                     raise ValueError("domains are incompatible.")
                 tval = getattr(self.val, op)(other.val)
                 return Field(self._domain, tval)

nifty5/logger.py

@@ -16,8 +16,8 @@
 # NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik
 # and financially supported by the Studienstiftung des deutschen Volkes.
 
-from __future__ import (absolute_import, division, print_function)
-from builtins import *
+from __future__ import absolute_import, division, print_function
+from .compat import *
 
 
 def _logger_init():

nifty5/minimization/energy_sum.py

@@ -16,7 +16,8 @@
 # NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik
 # and financially supported by the Studienstiftung des deutschen Volkes.
 
-from builtins import *
+from __future__ import absolute_import, division, print_function
+from ..compat import *
 from ..utilities import memo, my_lincomb_simple, my_lincomb
 from .energy import Energy
 

nifty5/minimization/iteration_controller.py

@@ -16,7 +16,8 @@
 # NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik
 # and financially supported by the Studienstiftung des deutschen Volkes.
 
-from builtins import range
+from __future__ import absolute_import, division, print_function
+from ..compat import *
 import abc
 from ..utilities import NiftyMetaBase
 

nifty5/minimization/l_bfgs.py

@@ -16,8 +16,8 @@
 # NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik
 # and financially supported by the Studienstiftung des deutschen Volkes.
 
-from __future__ import (absolute_import, division, print_function)
-from builtins import *
+from __future__ import absolute_import, division, print_function
+from ..compat import *
 from ..logger import logger
 from .descent_minimizer import DescentMinimizer
 from .line_search_strong_wolfe import LineSearchStrongWolfe

nifty5/minimization/line_search_strong_wolfe.py

@@ -16,8 +16,8 @@
 # NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik
 # and financially supported by the Studienstiftung des deutschen Volkes.
 
-from __future__ import division
-from builtins import range
+from __future__ import absolute_import, division, print_function
+from ..compat import *
 import numpy as np
 from .line_search import LineSearch
 from .line_energy import LineEnergy

nifty5/minimization/vl_bfgs.py

@@ -16,8 +16,8 @@
 # NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik
 # and financially supported by the Studienstiftung des deutschen Volkes.
 
-from __future__ import (absolute_import, division, print_function)
-from builtins import *
+from __future__ import absolute_import, division, print_function
+from ..compat import *
 import numpy as np
 from .descent_minimizer import DescentMinimizer
 from .line_search_strong_wolfe import LineSearchStrongWolfe

nifty5/operators/chain_operator.py

@@ -38,7 +38,7 @@ class ChainOperator(LinearOperator):
         from .diagonal_operator import DiagonalOperator
         # Step 1: verify domains
         for i in range(len(ops)-1):
-            if ops[i+1].target != ops[i].domain:
+            if ops[i+1].target is not ops[i].domain:
                 raise ValueError("domain mismatch")
         # Step 2: unpack ChainOperators
         opsnew = []

nifty5/operators/diagonal_operator.py

@@ -16,8 +16,8 @@
 # NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik
 # and financially supported by the Studienstiftung des deutschen Volkes.
 
-from __future__ import (absolute_import, division, print_function)
-from builtins import *
+from __future__ import absolute_import, division, print_function
+from ..compat import *
 import numpy as np
 from ..field import Field
 from ..domain_tuple import DomainTuple
@@ -66,7 +66,7 @@ class DiagonalOperator(EndomorphicOperator):
             self._domain = DomainTuple.make(domain)
         if spaces is None:
             self._spaces = None
-            if diagonal.domain != self._domain:
+            if diagonal.domain is not self._domain:
                 raise ValueError("domain mismatch")
         else:
             self._spaces = utilities.parse_spaces(spaces, len(self._domain))

nifty5/operators/fft_operator.py

@@ -73,7 +73,7 @@ class FFTOperator(LinearOperator):
 
     def _apply_cartesian(self, x, mode):
         axes = x.domain.axes[self._space]
-        tdom = self._target if x.domain == self._domain else self._domain
+        tdom = self._tgt(mode)
         oldax = dobj.distaxis(x.val)
         if oldax not in axes:  # straightforward, no redistribution needed
             ldat = x.local_data

nifty5/operators/sht_operator.py

@@ -121,7 +121,7 @@ class SHTOperator(LinearOperator):
         distaxis = dobj.distaxis(tval)
 
         p2h = not x.domain[self._space].harmonic
-        tdom = self._target if x.domain == self._domain else self._domain
+        tdom = self._tgt(mode)
         func = self._slice_p2h if p2h else self._slice_h2p
         idat = dobj.local_data(tval)
         odat = np.empty(dobj.local_shape(tdom.shape, distaxis=distaxis),

nifty5/operators/sum_operator.py

@@ -16,7 +16,8 @@
 # NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik
 # and financially supported by the Studienstiftung des deutschen Volkes.
 
-from builtins import *
+from __future__ import absolute_import, division, print_function
+from ..compat import *
 from ..utilities import my_sum
 from .linear_operator import LinearOperator
 import numpy as np

nifty5/probing/utils.py

@@ -16,7 +16,8 @@
 # NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik
 # and financially supported by the Studienstiftung des deutschen Volkes.
 
-from builtins import object
+from __future__ import absolute_import, division, print_function
+from ..compat import *
 from ..field import Field
 
 

nifty5/utilities.py

@@ -16,13 +16,12 @@
 # NIFTy is being developed at the Max-Planck-Institut fuer Astrophysik
 # and financially supported by the Studienstiftung des deutschen Volkes.
 
-from __future__ import (absolute_import, division, print_function)
-from builtins import *
+from __future__ import absolute_import, division, print_function
+from .compat import *
 import numpy as np
 from itertools import product
 import abc
 from future.utils import with_metaclass
-from functools import reduce
 import collections
 
 __all__ = ["get_slice_list", "safe_cast", "parse_spaces", "infer_space",