factor out constant

Lib/dis.py

@@ -10,6 +10,8 @@ __all__ = ["dis", "disassemble", "distb", "disco",
            "findlinestarts", "findlabels"] + _opcodes_all
 del _opcodes_all
 
+_have_code = (types.MethodType, types.FunctionType, types.CodeType, type)
+
 def dis(x=None):
     """Disassemble classes, methods, functions, or code.
 
@@ -26,8 +28,7 @@ def dis(x=None):
     if hasattr(x, '__dict__'):
         items = sorted(x.__dict__.items())
         for name, x1 in items:
-            if isinstance(x1, (types.MethodType, types.FunctionType,
-                               types.CodeType, type)):
+            if isinstance(x1, _have_code):
                 print("Disassembly of %s:" % name)
                 try:
                     dis(x1)