Tweak docs to not find spurious '== None' later.

theano/compile/debugmode.py

@@ -589,7 +589,7 @@ def debugprint(r, prefix='', depth=-1, done=None, print_type=False,
 
         r_name = getattr(r, 'name', '')
         # normally if the name isn't set, it'll be None, so
-        # r_name == None here
+        # r_name is None here
         if r_name is None:
             r_name = ''
 

theano/gof/graph.py

@@ -249,7 +249,8 @@ class Variable(utils.object2):
 
     - `RandomVariable`
 
-    A Variable which is the output of a symbolic computation will have an owner != None.
+    A Variable which is the output of a symbolic computation will have an owner
+    not equal to None.
 
     Using the Variables' owner field and the Apply nodes' inputs fields, one can navigate a graph
     from an output all the way to the inputs. The opposite direction is not possible until an

theano/tensor/basic.py

@@ -3178,7 +3178,7 @@ class Mean(elemwise.CAReduce):
         if self.axis is not None:
             return super(Op, self).c_code(node, name, inames, onames, sub)
         ret = elemwise.CAReduce.c_code(self, node, name, inames, onames, sub)
-        #TODO: c_code perform support only axis==None
+        #TODO: c_code perform support only axis is None
         return ret + """
   *((double *)PyArray_DATA(%s)) /= PyArray_SIZE(%s);
   """ % (onames[0], inames[0])