enable faker instances to be unpickled (#1480)

faker/proxy.py

@@ -127,6 +127,9 @@ def __deepcopy__(self, memodict={}):
         }
         return result
 
+    def __setstate__(self, state):
+        self.__dict__.update(state)
+
     @property
     def unique(self):
         return self._unique_proxy
@@ -280,6 +283,16 @@ def __getattr__(self, name: str):
         else:
             raise TypeError("Accessing non-functions through .unique is not supported.")
 
+    def __getstate__(self):
+        # Copy the object's state from self.__dict__ which contains
+        # all our instance attributes. Always use the dict.copy()
+        # method to avoid modifying the original state.
+        state = self.__dict__.copy()
+        return state
+
+    def __setstate__(self, state):
+        self.__dict__.update(state)
+
     def _wrap(self, name, function):
         @functools.wraps(function)
         def wrapper(*args, **kwargs):

tests/test_proxy.py

@@ -1,4 +1,5 @@
 import copy
+import pickle
 import random
 
 from collections import OrderedDict
@@ -396,3 +397,8 @@ def test_copy(self):
         fake2 = copy.deepcopy(fake)
         assert fake.locales == fake2.locales
         assert fake.locales is not fake2.locales
+
+    def test_pickle(self):
+        fake = Faker()
+        pickled = pickle.dumps(fake)
+        pickle.loads(pickled)