Issue #25665: Make NamedTuple picklable.

Guido van Rossum · Guido van Rossum · commit 3819cbc1776b · 2015-11-19T08:15:06.000-08:00
diff --git a/src/test_typing.py b/src/test_typing.py
@@ -1163,6 +1163,14 @@ def test_basics(self):
         assert Emp._fields == ('name', 'id')
         assert Emp._field_types == dict(name=str, id=int)
 
+    def test_pickle(self):
+        global Emp  # pickle wants to reference the class by name
+        Emp = NamedTuple('Emp', [('name', str), ('id', int)])
+        jane = Emp('jane', 37)
+        z = pickle.dumps(jane)
+        jane2 = pickle.loads(z)
+        assert jane == jane2
+
 
 class IOTests(TestCase):
 
diff --git a/src/typing.py b/src/typing.py
@@ -1479,6 +1479,11 @@ def NamedTuple(typename, fields):
     fields = [(n, t) for n, t in fields]
     cls = collections.namedtuple(typename, [n for n, t in fields])
     cls._field_types = dict(fields)
+    # Set the module to the caller's module (otherwise it'd be 'typing').
+    try:
+        cls.__module__ = sys._getframe(1).f_globals.get('__name__', '__main__')
+    except (AttributeError, ValueError):
+        pass
     return cls
 
 
