add pickle ability

skin.py

@@ -3,7 +3,7 @@
 
 
 __all__ = ("Skin",)
-__version__ = "0.0.5"
+__version__ = "0.0.6"
 version = tuple(map(int, __version__.split(".")))
 
 
@@ -14,7 +14,6 @@ class SkinValueError(ValueError):
 DEFAULT_VALUE = object()
 ANY = object()
 FORBIDDEN = (str, bytes, bytearray, memoryview, range)
-TRANSPARENT_ATTRIBUTES = {"value", "__class__", "__deepcopy__"}
 
 
 def _wrapper_or_value(self, value=DEFAULT_VALUE, *, parent=None, parent_name=None):
@@ -27,6 +26,10 @@ def _wrapper_or_value(self, value=DEFAULT_VALUE, *, parent=None, parent_name=Non
         return value
 
 
+def _special_method(name):
+    return name.startswith("__") and name.endswith("__") or name == "value"
+
+
 class Skin:
 
     def __init__(self, value=DEFAULT_VALUE, *, allowed=ANY, forbidden=FORBIDDEN, _parent=None, _parent_name=None):
@@ -49,11 +52,13 @@ def __init__(self, value=DEFAULT_VALUE, *, allowed=ANY, forbidden=FORBIDDEN, _pa
         setter("parent_name", _parent_name)
 
     def __getattribute__(self, name):
-        if name not in TRANSPARENT_ATTRIBUTES:
-            raise AttributeError
+        if _special_method(name):
+            return super().__getattribute__(name)
         return super().__getattribute__(name)
 
     def __getattr__(self, name):
+        if _special_method(name):
+            raise AttributeError
         if hasattr(self.value, name):
             return getattr(self.value, name)
         return self[name]

tests.py

@@ -1,5 +1,6 @@
 import collections
 import copy
+import pickle
 
 import pytest
 
@@ -188,3 +189,8 @@ def test_config_inheritance():
     s1 = Skin(forbidden=(set,))
     s2 = s1.foo.bar.baz
     assert super(Skin, s1).__getattribute__("forbidden") is super(Skin, s2).__getattribute__("forbidden")
+
+
+def test_pickle(s):
+    x = pickle.loads(pickle.dumps(s))
+    assert x.value == s.value