Split some lines, add a comment explaining "else:" after "try: / except:"

theano/gof/cc.py

@@ -511,18 +511,24 @@ class CLinker(link.Linker):
 
             op = node.op
             # type-specific support code
-            try: c_support_code_apply.append(op.c_support_code_apply(node, name))
-            except utils.MethodNotDefined: pass
+            try:
+                c_support_code_apply.append(op.c_support_code_apply(node, name))
+            except utils.MethodNotDefined:
+                pass
             else:
-                assert isinstance(c_support_code_apply[-1], str), str(node.op)+" didn't returned a string for c_support_code_apply"
+                # The following will be executed if the "try" block succeeds
+                assert isinstance(c_support_code_apply[-1], str), (
+                        str(node.op)+" didn't returned a string for c_support_code_apply")
 
             # emit c_code 
-            try: behavior = op.c_code(node, name, isyms, osyms, sub)
+            try:
+                behavior = op.c_code(node, name, isyms, osyms, sub)
             except utils.MethodNotDefined:
                 raise NotImplementedError("%s cannot produce C code" % op)
             assert isinstance(behavior,str), str(node.op)+" didn't returned a string for c_code"
 
-            try: cleanup = op.c_code_cleanup(node, name, isyms, osyms, sub)
+            try:
+                cleanup = op.c_code_cleanup(node, name, isyms, osyms, sub)
             except utils.MethodNotDefined:
                 cleanup = ""