diff --git a/_compatibility.py b/_compatibility.py
index 4998b430..8536f4e6 100644
--- a/_compatibility.py
+++ b/_compatibility.py
@@ -4,8 +4,7 @@ python versions.
 """
 import sys
 
-def is_py3k():
-    return sys.hexversion >= 0x03000000
+is_py3k =  sys.hexversion >= 0x03000000
 
 is_py25 = sys.hexversion < 0x02060000
 
@@ -63,7 +62,7 @@ except NameError:
         return s.decode("utf-8")
 
 # exec function
-if is_py3k():
+if is_py3k:
     def exec_function(source, global_map):
         exec(source, global_map)
 else:
@@ -72,7 +71,7 @@ else:
 
 # tokenize function
 import tokenize
-if is_py3k():
+if is_py3k:
     tokenize_func = tokenize.tokenize
 else:
     tokenize_func = tokenize.generate_tokens
@@ -84,7 +83,7 @@ except ImportError:
     from io import BytesIO
 
 # hasattr function used because python 
-if is_py3k():
+if is_py3k:
     hasattr = hasattr
 else:
     def hasattr(obj, name):
diff --git a/builtin.py b/builtin.py
index 50884b2f..520e483c 100644
--- a/builtin.py
+++ b/builtin.py
@@ -3,7 +3,7 @@ from _compatibility import exec_function, is_py3k
 import re
 import sys
 import os
-if is_py3k():
+if is_py3k:
     import io
 else:
     import types
@@ -78,7 +78,7 @@ class Parser(CachedModule):
         # TODO things like dbg: ('not working', 'tuple of integers')
     }
 
-    if is_py3k():
+    if is_py3k:
         map_types['file object'] = 'import io; return io.TextIOWrapper(file)'
 
     module_cache = {}
@@ -170,14 +170,14 @@ class Parser(CachedModule):
 
         try:
             name = self.name
-            if name == '__builtin__' and not is_py3k():
+            if name == '__builtin__' and not is_py3k:
                 name = 'builtins'
             f = open(os.path.sep.join(['mixin', name]) + '.py')
         except IOError:
             return {}
         else:
             mixin_dct = process_code(f.read())
-            if is_py3k() and self.name == _Builtin.name:
+            if is_py3k and self.name == _Builtin.name:
                 # in the case of Py3k xrange is now range
                 mixin_dct['range'] = mixin_dct['xrange']
             return mixin_dct
@@ -309,7 +309,7 @@ class Parser(CachedModule):
 
         # variables
         for name, value in stmts.items():
-            if is_py3k():
+            if is_py3k:
                 file_type = io.TextIOWrapper
             else:
                 file_type = types.FileType
@@ -401,7 +401,7 @@ def parse_function_doc(func):
 class _Builtin(object):
     """ The builtin scope / module """
     # Python 3 compatibility
-    if is_py3k():
+    if is_py3k:
         name = 'builtins'
     else:
         name = '__builtin__'
diff --git a/evaluate.py b/evaluate.py
index 7f49908d..11fc3ccb 100644
--- a/evaluate.py
+++ b/evaluate.py
@@ -1168,7 +1168,7 @@ def get_iterator_types(inputs):
             result += gen.get_index_types()
         elif isinstance(gen, Instance):
             # __iter__ returned an instance.
-            name = '__next__' if is_py3k() else 'next'
+            name = '__next__' if is_py3k else 'next'
             try:
                 result += gen.execute_subscope_by_name(name)
             except KeyError:
diff --git a/keywords.py b/keywords.py
index 3c52223a..f7dd0817 100644
--- a/keywords.py
+++ b/keywords.py
@@ -14,7 +14,7 @@ except ImportError:
         # Python 2.5
         pydoc_topics = None
 
-if is_py3k():
+if is_py3k:
     keys = keyword.kwlist
 else:
     keys = keyword.kwlist + ['None', 'False', 'True']
diff --git a/parsing.py b/parsing.py
index c7406968..fd9da882 100644
--- a/parsing.py
+++ b/parsing.py
@@ -1049,7 +1049,7 @@ class PyFuzzyParser(object):
         self.user_stmt = None
         self.code = code + '\n'  # end with \n, because the parser needs it
         self.no_docstr = no_docstr
-        if is_py3k():
+        if is_py3k:
             self.code = self.code.encode()
 
         # initialize global Scope