remove python2x.py, fix imports associated with it

theano/compat/__init__.py

@@ -58,8 +58,7 @@ else:
 
     cmp = cmp
 
-    # Older Python 2.x compatibility
-    from theano.compat.python2x import DictMixin, OrderedDict
+    from collections import OrderedDict, MutableMapping as DictMixin
 
     def decode(x):
         return x

theano/compat/python2x.py

-"""
-Helper functions to make theano backwards compatible with python 2.6 - 2.7
-Now mostly there for compatibility as we don't support Python 2.6 anymore.
-"""
-from __future__ import absolute_import, print_function, division
-
-try:
-    from UserDict import DictMixin
-except ImportError:
-    from collections import MutableMapping as DictMixin
-from collections import OrderedDict, Counter
-
-__all__ = ['DictMixin', 'OrderedDict', 'Counter']

theano/compile/ops.py

@@ -5,6 +5,7 @@ help make new Ops more rapidly.
 
 """
 from __future__ import absolute_import, print_function, division
+from collections import OrderedDict
 
 import copy
 import six.moves.cPickle as pickle
@@ -12,7 +13,6 @@ import warnings
 
 import theano
 from theano import gof
-from theano.compat import OrderedDict
 from six import iteritems, integer_types
 from six.moves import xrange
 

theano/gof/destroyhandler.py

@@ -5,14 +5,13 @@ and inplace operations.
 """
 from __future__ import absolute_import, print_function, division
 
-from collections import deque
+from collections import deque, OrderedDict
 
 from six import iteritems
 
 import theano
 from . import toolbox
 from . import graph
-from theano.compat import OrderedDict
 from theano.misc.ordered_set import OrderedSet
 
 from .fg import InconsistencyError

theano/gof/fg.py

@@ -5,6 +5,7 @@ types that it can raise.
 
 """
 from __future__ import absolute_import, print_function, division
+from collections import OrderedDict
 import sys
 import time
 import traceback
@@ -15,7 +16,6 @@ from theano.gof import utils
 from theano.gof import toolbox
 from theano import config
 
-from theano.compat import OrderedDict
 from six import iteritems, itervalues
 from six.moves import StringIO
 from theano.misc.ordered_set import OrderedSet

theano/gof/opt.py

@@ -5,7 +5,7 @@ amount of useful generic optimization tools.
 """
 from __future__ import absolute_import, print_function, division
 
-from collections import deque, defaultdict
+from collections import deque, defaultdict, OrderedDict
 import copy
 import inspect
 import logging
@@ -19,7 +19,7 @@ import numpy
 
 import theano
 from theano import config
-from theano.compat import izip, OrderedDict
+from theano.compat import izip
 from six import string_types, iteritems, itervalues, integer_types
 from six.moves import reduce
 from theano.gof import graph, op, utils, unify, toolbox

theano/gof/tests/test_utils.py

 from __future__ import absolute_import, print_function, division
+from collections import OrderedDict
 import theano
-from theano.compat import OrderedDict
 from theano.gof.utils import (
     give_variables_names, hash_from_dict, remove, unique)
 

theano/gof/toolbox.py

 from __future__ import absolute_import, print_function, division
 from functools import partial
+from collections import OrderedDict
+
 import sys
 import time
 import inspect
 
 import theano
 from theano import config
-from theano.compat import OrderedDict
 from theano.gof import graph
 
 

theano/gof/utils.py

 from __future__ import absolute_import, print_function, division
+from collections import OrderedDict
 import linecache
 import sys
 import traceback
@@ -8,7 +9,7 @@ from six import iteritems, integer_types, string_types, with_metaclass
 from six.moves import StringIO
 
 from theano import config
-from theano.compat import OrderedDict, PY3
+from theano.compat import PY3
 
 
 def simple_extract_stack(f=None, limit=None, skips=[]):

theano/gradient.py

 """Driver for gradient calculations."""
 from __future__ import absolute_import, print_function, division
+from collections import OrderedDict
 import six.moves.builtins as builtins
 import logging
 import time
@@ -12,7 +13,7 @@ import theano
 
 from theano import gof
 from theano.gof import utils, Variable
-from theano.compat import OrderedDict, izip
+from theano.compat import izip
 from six.moves import xrange, reduce
 from theano.gof.null_type import NullType, null_type
 from theano.gof.op import get_debug_values

theano/scan_module/scan.py

@@ -47,6 +47,7 @@ __contact__ = "Razvan Pascanu <r.pascanu@gmail>"
 import logging
 import numpy
 import warnings
+from collections import OrderedDict
 
 from theano.compat import ifilter, izip
 from six import iteritems, integer_types
@@ -59,7 +60,6 @@ from theano import tensor
 from theano import config
 from theano.updates import OrderedUpdates
 from theano.compile import ops
-from theano.compat import OrderedDict
 
 
 from theano.scan_module import scan_op

theano/scan_module/scan_op.py

@@ -60,6 +60,7 @@ import copy
 import itertools
 import logging
 import time
+from collections import OrderedDict
 
 import numpy
 from six import iteritems, integer_types
@@ -73,7 +74,7 @@ from theano import compile, config, gradient, gof, tensor
 from theano.gof import PureOp, Apply
 from theano.gof.graph import io_connection_pattern
 from theano.gof.toolbox import NoOutputFromInplace
-from theano.compat import OrderedDict, izip
+from theano.compat import izip
 from theano.tensor import TensorType
 from theano.tensor.opt import Shape_i
 from theano.gradient import grad_undefined, DisconnectedType, NullType

theano/scan_module/scan_opt.py

@@ -53,13 +53,13 @@ from __future__ import absolute_import, print_function, division
 import logging
 import copy
 from sys import maxsize
+from collections import OrderedDict
 import numpy
 
 import theano
 from theano import tensor, scalar
 from theano.tensor import opt, get_scalar_constant_value, Alloc, AllocEmpty
 from theano import gof
-from theano.compat import OrderedDict
 from six import integer_types, iteritems
 from six.moves import xrange
 from theano.compile import optdb

theano/scan_module/scan_utils.py

@@ -18,6 +18,7 @@ __contact__ = "Razvan Pascanu <r.pascanu@gmail>"
 import copy
 import logging
 import warnings
+from collections import OrderedDict
 
 import numpy
 
@@ -28,7 +29,6 @@ from six.moves import xrange
 from theano.compile.pfunc import rebuild_collect_shared
 from theano import gof, compat
 from theano import tensor, scalar
-from theano.compat import OrderedDict
 from theano.tensor.basic import get_scalar_constant_value
 
 

theano/scan_module/tests/test_scan.py

@@ -7,6 +7,7 @@ from tempfile import mkdtemp
 import time
 import unittest
 import copy
+from collections import OrderedDict
 
 import six.moves.cPickle as pickle
 from six.moves import xrange
@@ -23,7 +24,7 @@ from theano.compile.pfunc import rebuild_collect_shared
 from theano.tests import unittest_tools as utt
 import theano.scalar.sharedvar
 from theano.scan_module.scan_op import Scan
-from theano.compat import PY3, OrderedDict
+from theano.compat import PY3
 from theano.tests.unittest_tools import attr
 
 

theano/tensor/tests/mlp_test.py

@@ -7,11 +7,11 @@ from __future__ import absolute_import, print_function, division
 __docformat__ = 'restructedtext en'
 
 
+from collections import OrderedDict
 import numpy
 
 import theano
 import theano.tensor as T
-from theano.compat import OrderedDict
 
 
 def gen_data():

theano/tests/test_determinism.py

 from __future__ import absolute_import, print_function, division
+from collections import OrderedDict
 from theano.tests.record import RecordMode, Record
-from theano.compat import OrderedDict
 from theano.tests import disturb_mem
 import numpy as np
 import theano

theano/tests/test_gradient.py

 from __future__ import absolute_import, print_function, division
+from collections import OrderedDict
 #
 # UNIT TEST
 #
@@ -9,7 +10,7 @@ from six.moves import xrange
 
 import theano
 from theano import gof
-from theano.compat import OrderedDict, izip
+from theano.compat import izip
 from theano.tests import unittest_tools as utt
 
 from theano import gradient

theano/tests/test_pickle_unpickle_theano_fn.py

@@ -13,9 +13,9 @@ The config option is in configdefaults.py
 
 This note is written by Li Yao.
 """
+from collections import OrderedDict
 import numpy
 import six.moves.cPickle as pickle
-from theano.compat import OrderedDict
 import theano
 import theano.tensor as T
 

theano/updates.py

@@ -2,7 +2,7 @@
 
 """
 from __future__ import absolute_import, print_function, division
-from theano.compat import OrderedDict
+from collections import OrderedDict
 
 from six import iteritems
 from theano.compile.sharedvalue import SharedVariable