change behaviour of same_type function in RestrictedPython.Utilities …

…so that it returns a bool instaed of 0 or 1.

This is a proposal for #122

src/RestrictedPython/Utilities.py

@@ -37,8 +37,8 @@ def same_type(arg1, *args):
     t = getattr(arg1, '__class__', type(arg1))
     for arg in args:
         if getattr(arg, '__class__', type(arg)) is not t:
-            return 0
-    return 1
+            return False
+    return True
 
 
 utility_builtins['same_type'] = same_type

tests/builtins/test_utilities.py

@@ -76,7 +76,7 @@ def test_sametype_only_two_args_different():
 
     class Foo(object):
         pass
-    assert same_type(object(), Foo()) is 0
+    assert same_type(object(), Foo()) is False
 
 
 def test_sametype_only_multiple_args_same():
@@ -89,7 +89,7 @@ def test_sametype_only_multipe_args_one_different():
 
     class Foo(object):
         pass
-    assert same_type(object(), object(), Foo()) is 0
+    assert same_type(object(), object(), Foo()) is False
 
 
 def test_test_single_value_true():