Add support for pickling, closes #19, closes #11

funcsigs/__init__.py

@@ -263,6 +263,14 @@ def __init__(self, name, kind, default=_empty, annotation=_empty,
 
         self._partial_kwarg = _partial_kwarg
 
+
+    def __getstate__(self):
+        return tuple(getattr(self, k) for k in self.__slots__)
+
+    def __setstate__(self, items):
+        for k, item in zip(self.__slots__, items):
+            setattr(self, k, item)
+
     @property
     def name(self):
         return self._name
@@ -509,6 +517,13 @@ def __init__(self, parameters=None, return_annotation=_empty,
         self._parameters = params
         self._return_annotation = return_annotation
 
+    def __getstate__(self):
+        return tuple(getattr(self, k) for k in self.__slots__)
+
+    def __setstate__(self, items):
+        for k, item in zip(self.__slots__, items):
+            setattr(self, k, item)
+
     @classmethod
     def from_function(cls, func):
         '''Constructs Signature for the given python function'''

tests/test_inspect.py

@@ -1,6 +1,7 @@
 # Copyright 2001-2013 Python Software Foundation; All Rights Reserved
 from __future__ import absolute_import, division, print_function
 import collections
+import pickle
 import sys
 
 try:
@@ -65,6 +66,13 @@ def test(po, pk, *args, ko, **kwargs):
         S((po, pk, args, kwargs2, ko))
 """)
 
+    def test_signature_pickling(self):
+        def foo(a): pass
+
+        sig = inspect.signature(foo)
+
+        self.assertEqual(sig, pickle.loads(pickle.dumps(sig)))
+
     def test_signature_immutability(self):
         def test(a):
             pass