Fix python3 problems.

theano/compile/profilemode.py

@@ -661,9 +661,9 @@ Test them first, as they are not guaranteed to always provide a speedup.""")
         if not config.lib.amdlibm and any([exp_float32_op(a.op) and
                                            a.inputs[0].dtype == 'float32'
                                            for i, a in apply_time]):
-            print ("  - With the default gcc libm, exp in float32 is slower "
-                   "than in float64! Try Theano flag floatX=float64, or "
-                   "install amdlibm and set the theano flags lib.amdlibm=True")
+            print("  - With the default gcc libm, exp in float32 is slower "
+                  "than in float64! Try Theano flag floatX=float64, or "
+                  "install amdlibm and set the theano flags lib.amdlibm=True")
             printed_tip = True
 
         # tip 4
@@ -672,11 +672,11 @@ Test them first, as they are not guaranteed to always provide a speedup.""")
             if (isinstance(node.op, T.Dot) and
                     all([len(i.type.broadcastable) == 2
                          for i in node.inputs])):
-                print(("  - You have a dot operation that was not optimized to"
-                       " dot22 (which is faster). Make sure the inputs are "
-                       "float32 or float64, and are the same for both inputs. "
-                       "Currently they are: %s" %
-                       [i.type for i in node.inputs]))
+                print("  - You have a dot operation that was not optimized to"
+                      " dot22 (which is faster). Make sure the inputs are "
+                      "float32 or float64, and are the same for both inputs. "
+                      "Currently they are: %s" %
+                      [i.type for i in node.inputs])
                 printed_tip = True
 
         # tip 5
@@ -684,13 +684,13 @@ Test them first, as they are not guaranteed to always provide a speedup.""")
             node = a[1]
             if isinstance(node.op, RandomFunction):
                 printed_tip = True
-                print ("  - Replace the default random number generator by "
-                       "'from theano.sandbox.rng_mrg import MRG_RandomStreams "
-                       "as RandomStreams', as this is is faster. It is still "
-                       "experimental, but seems to work correctly.")
+                print("  - Replace the default random number generator by "
+                      "'from theano.sandbox.rng_mrg import MRG_RandomStreams "
+                      "as RandomStreams', as this is is faster. It is still "
+                      "experimental, but seems to work correctly.")
                 if config.device.startswith("gpu"):
-                    print ("     - MRG_RandomStreams is the only random number"
-                           " generator supported on the GPU.")
+                    print("     - MRG_RandomStreams is the only random number"
+                          " generator supported on the GPU.")
                 break
 
         if not printed_tip:

theano/gof/optdb.py

@@ -312,7 +312,7 @@ class SequenceDB(DB):
         positions = list(self.__position__.items())
 
         def c(a, b):
-            return cmp(a[1], b[1])
+            return ((a > b) - (a < b))
         positions.sort(c)
 
         print("  position", positions, file=stream)

theano/tests/test_flake8.py

@@ -6,7 +6,6 @@ from nose.plugins.skip import SkipTest
 import os
 from fnmatch import fnmatch
 import theano
-from theano.compat import PY3
 try:
     import flake8.engine
     import flake8.main