Metaclass is declared in the class declaration

Author: Bernardo-MG

dice_notation/dice.py

@@ -24,7 +24,7 @@
     xrange = range
 
 
-class Rollable(object):
+class Rollable(object, metaclass=ABCMeta):
     """
     Interface for rollable classes.
 
@@ -37,7 +37,6 @@ class Rollable(object):
 
     As such, the value generated by rolling may be anything.
     """
-    __metaclass__ = ABCMeta
 
     def __init__(self):
         pass

dice_notation/parser/common.py

@@ -17,16 +17,14 @@
 __license__ = 'MIT'
 
 
-class Parser(object):
+class Parser(object, metaclass=ABCMeta):
     """
     Interface for implementing parsers.
 
     It just contains a single method, 'parse', which will receive a value
     and take care of parsing it into another.
     """
 
-    __metaclass__ = ABCMeta
-
     def __init__(self):
         pass