Add some basic ABCs.

discord/abc.py

@@ -0,0 +1,77 @@
+# -*- coding: utf-8 -*-
+
+"""
+The MIT License (MIT)
+
+Copyright (c) 2015-2016 Rapptz
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+"""
+
+import abc
+
+class Snowflake(metaclass=abc.ABCMeta):
+    __slots__ = ()
+
+    @property
+    @abc.abstractmethod
+    def created_at(self):
+        raise NotImplementedError
+
+    @classmethod
+    def __subclasshook__(cls, C):
+        if cls is Snowflake:
+            mro = C.__mro__
+            for attr in ('created_at', 'id'):
+                for base in mro:
+                    if attr in base.__dict__:
+                        break
+                else:
+                    return NotImplemented
+            return True
+        return NotImplemented
+
+class User(metaclass=abc.ABCMeta):
+    __slots__ = ()
+
+    @property
+    @abc.abstractmethod
+    def display_name(self):
+        raise NotImplementedError
+
+    @property
+    @abc.abstractmethod
+    def mention(self):
+        raise NotImplementedError
+
+    @classmethod
+    def __subclasshook__(cls, C):
+        if cls is User:
+            if Snowflake.__subclasshook__(C) is NotImplemented:
+                return NotImplemented
+
+            mro = C.__mro__
+            for attr in ('display_name', 'mention', 'name', 'avatar', 'discriminator', 'bot'):
+                for base in mro:
+                    if attr in base.__dict__:
+                        break
+                else:
+                    return NotImplemented
+            return True
+        return NotImplemented