Issue #287

Author: loyada

tests/test_common.py

@@ -1,19 +1,17 @@
-import sys
 from typing import List
 
-import pytest
 
 from typedpy import Integer, String, Structure, StructureReference
-from typedpy.commons import deep_get, nested
+from typedpy.commons import deep_get, nested, Undefined
 
 
 def test_deep_get():
     assert deep_get({"a1": {"b": {"c": 5}}, "a2": 2}, "a1.b.c") == 5
     assert deep_get({"a1": {"b": {"c": 5}}, "a2": 2}, "a2") == 2
     assert deep_get({"a1": {"b": {"c": 5}}, "a2": 2}, "a1.x") is None
+    assert deep_get({}, "x.y") is None
+    assert deep_get({}, "x.y", enable_undefined=True) is Undefined
 
-
-@pytest.mark.skipif(sys.version_info < (3, 7), reason="requires python3.7 or higher")
 def test_nested_list():
     class Bar(Structure):
         x = StructureReference(i=Integer(), s=String())

tests/test_undefined.py

@@ -44,3 +44,8 @@ def test_undefined_serialization():
     assert Serializer(Foo(a=None)).serialize() == {"a": None, "d": 5}
     assert Serializer(Foo()).serialize() == {"d": 5}
     assert Serializer(Bar()).serialize() == {}
+
+
+def test_deserialize_empty_with_undefined():
+    foo = Deserializer(Foo).deserialize({})
+    assert foo.a is Undefined

typedpy/commons.py

@@ -199,6 +199,8 @@ def _get_next_level(
         return default
 
     keys = deep_key.split(".")
+    if not dictionary:
+        return Undefined if enable_undefined else None
     result = reduce(
         lambda d, key: _get_next_level(
             d, key, default, enable_undefined=enable_undefined