Modified nifty_field.py to successfully initialize with multiple spaces and a field_type.

Therefore made the Field_type base class more advanced.
Added default field dtype to nifty configuration.

__init__.py

@@ -50,7 +50,8 @@ from nifty_paradict import space_paradict,\
                             point_space_paradict,\
                             nested_space_paradict
 
-from field_types import Field_array
+from field_types import Field_type,\
+                        Field_array
 
 from operators import *
 

config/nifty_config.py

 # -*- coding: utf-8 -*-
 
 import os
-
+import numpy as np
 import keepers
 
 # Setup the dependency injector
@@ -50,6 +50,21 @@ variable_verbosity = keepers.Variable('verbosity',
                                       lambda z: z == abs(int(z)),
                                       genus='int')
 
+
+def _dtype_validator(dtype):
+    try:
+        np.dtype(dtype)
+    except(TypeError):
+        return False
+    else:
+        return True
+
+variable_default_field_dtype = keepers.Variable(
+                              'default_field_dtype',
+                              ['float'],
+                              _dtype_validator,
+                              genus='str')
+
 variable_default_datamodel = keepers.Variable(
                               'default_datamodel',
                               ['fftw', 'equal'],
@@ -64,6 +79,7 @@ nifty_configuration = keepers.get_Configuration(
                       variable_use_healpy,
                       variable_use_libsharp,
                       variable_verbosity,
+                      variable_default_field_dtype,
                       variable_default_datamodel,
                       ],
                      path=os.path.expanduser('~') + "/.nifty/nifty_config")

field_types/__init__.py

 # -*- coding: utf-8 -*-
 
-from field_array import Field_array
\ No newline at end of file
+from field_array import Field_type,\
+                        Field_array
\ No newline at end of file

field_types/base_field_type.py

 # -*- coding: utf-8 -*-
 
+import numpy as np
 
-class Base_field_type(object):
-    def __init__(self, shape):
-        self.shape = shape
 
-    @property
-    def shape(self):
-        return self._shape
-
-    @shape.setter
-    def shape(self, shape):
+class Field_type(object):
+    def __init__(self, shape, dtype):
         try:
             new_shape = tuple([int(i) for i in shape])
         except TypeError:
             new_shape = (int(shape), )
         self._shape = new_shape
 
+        self._dtype = np.dtype(dtype)
+
+    @property
+    def shape(self):
+        return self._shape
+
+    @property
+    def dtype(self):
+        return self._dtype
+
+    def get_dof(self, split=False):
+        if issubclass(self.dtype.type, np.complexfloating):
+            multiplicator = 2
+        else:
+            multiplicator = 1
+
+        if split:
+            dof = tuple(multiplicator*np.array(self.shape))
+        else:
+            dof = multiplicator*reduce(lambda x, y: x*y, self.shape)
+
+        return dof
+
     def process(self, method_name, array, inplace=True, **kwargs):
         try:
             result_array = self.__getattr__(method_name)(array,
@@ -29,3 +46,6 @@ class Base_field_type(object):
                 result_array = array.copy()
 
         return result_array
+
+    def complement_cast(self, x, axis=None):
+        return x

field_types/field_array.py

 # -*- coding: utf-8 -*-
 
 
-from base_field_type import Base_field_type
+from base_field_type import Field_type
 
 
-class Field_array(Base_field_type):
+class Field_array(Field_type):
     pass

nifty_core.py

@@ -311,7 +311,7 @@ class space(object):
         raise NotImplementedError(about._errors.cstring(
             "ERROR: no generic instance method 'dof'."))
 
-    def _complement_cast(self, x, axis=None):
+    def complement_cast(self, x, axis=None):
         return x
 
     # TODO: Move enforce power into power_indices class

setup.py

@@ -33,7 +33,8 @@ setup(name="ift_nifty",
       description="Numerical Information Field Theory",
       url="http://www.mpa-garching.mpg.de/ift/nifty/",
       packages=["nifty", "nifty.demos", "nifty.rg", "nifty.lm",
-                "nifty.operators", "nifty.dummys", "nifty.config"],
+                "nifty.operators", "nifty.dummys", "nifty.field_types",
+                "nifty.config"],
       package_dir={"nifty": ""},
       zip_safe=False,
       dependency_links=[