Do not extend AND/OR/NOT from BasePermission

This can be done in a separate pull request, but it was reverted out of this one because it made it more difficult to review and increased its chances of not being accepted.

rest_framework/permissions.py

@@ -47,6 +47,51 @@ class OperandHolder(OperationHolderMixin):
         return self.operator_class(op1, op2)
 
 
+class AND:
+    def __init__(self, *args):
+        self.permissions = args
+
+    def has_permission(self, request, view):
+        for permission in self.permissions:
+            if not permission.has_permission(request, view):
+                return False
+        return True
+
+    def has_object_permission(self, request, view, obj):
+        for permission in self.permissions:
+            if not permission.has_object_permission(request, view, obj):
+                return False
+        return True
+
+
+class OR:
+    def __init__(self, *args):
+        self.permissions = args
+
+    def has_permission(self, request, view):
+        for permission in self.permissions:
+            if permission.has_permission(request, view):
+                return True
+        return False
+
+    def has_object_permission(self, request, view, obj):
+        for permission in self.permissions:
+            if permission.has_object_permission(request, view, obj):
+                return True
+        return False
+
+
+class NOT:
+    def __init__(self, op1):
+        self.op1 = op1
+
+    def has_permission(self, request, view):
+        return not self.op1.has_permission(request, view)
+
+    def has_object_permission(self, request, view, obj):
+        return not self.op1.has_object_permission(request, view, obj)
+
+
 class BasePermissionMetaclass(OperationHolderMixin, type):
     pass
 
@@ -69,51 +114,6 @@ class BasePermission(metaclass=BasePermissionMetaclass):
         return True
 
 
-class AND(BasePermission):
-    def __init__(self, *args):
-        self.permissions = args
-
-    def has_permission(self, request, view):
-        for permission in self.permissions:
-            if not permission.has_permission(request, view):
-                return False
-        return True
-
-    def has_object_permission(self, request, view, obj):
-        for permission in self.permissions:
-            if not permission.has_object_permission(request, view, obj):
-                return False
-        return True
-
-
-class OR(BasePermission):
-    def __init__(self, *args):
-        self.permissions = args
-
-    def has_permission(self, request, view):
-        for permission in self.permissions:
-            if permission.has_permission(request, view):
-                return True
-        return False
-
-    def has_object_permission(self, request, view, obj):
-        for permission in self.permissions:
-            if permission.has_object_permission(request, view, obj):
-                return True
-        return False
-
-
-class NOT(BasePermission):
-    def __init__(self, op1):
-        self.op1 = op1
-
-    def has_permission(self, request, view):
-        return not self.op1.has_permission(request, view)
-
-    def has_object_permission(self, request, view, obj):
-        return not self.op1.has_object_permission(request, view, obj)
-
-
 class AllowAny(BasePermission):
     """
     Allow any access.