Remove compatibility with_metaclass method (#254)

thriftpy2/_compat.py

@@ -16,24 +16,3 @@
 
 UNIX = platform.system() in ("Linux", "Darwin")
 CYTHON = UNIX and not PYPY  # Cython always disabled in pypy and windows
-
-
-def with_metaclass(meta, *bases):
-    """Create a base class with a metaclass for py2 & py3
-
-    This code snippet is copied from six."""
-    # This requires a bit of explanation: the basic idea is to make a
-    # dummy metaclass for one level of class instantiation that replaces
-    # itself with the actual metaclass.  Because of internal type checks
-    # we also need to make sure that we downgrade the custom metaclass
-    # for one level to something closer to type (that's why __call__ and
-    # __init__ comes back from type etc.).
-    class metaclass(meta):
-        __call__ = type.__call__
-        __init__ = type.__init__
-
-        def __new__(cls, name, this_bases, d):
-            if this_bases is None:
-                return type.__new__(cls, name, (), d)
-            return meta(name, bases, d)
-    return metaclass('temporary_class', None, {})

thriftpy2/thrift.py

@@ -14,8 +14,6 @@
 import types
 from itertools import zip_longest
 
-from ._compat import with_metaclass
-
 
 def args_to_kwargs(thrift_spec, *args, **kwargs):
     for item, value in zip_longest(sorted(thrift_spec.items()), args):
@@ -149,7 +147,7 @@ def gen_init(cls, thrift_spec=None, default_spec=None):
     return cls
 
 
-class TPayload(with_metaclass(TPayloadMeta, object)):
+class TPayload(metaclass=TPayloadMeta):
 
     __hash__ = None