Merge pull request #6 from harryfyx/harryfyx-patch-1

Fix copy function.

metadict/metadict.py

@@ -1,4 +1,5 @@
 import contextlib
+import copy
 import keyword
 import re
 import warnings
@@ -162,7 +163,7 @@ def copy(self) -> 'MetaDict':
     def __copy__(self) -> 'MetaDict':
         cls = self.__class__
         result = cls.__new__(cls)
-        result.__dict__.update(self.__dict__)
+        result.__dict__.update({k: copy.copy(v) for k, v in self.__dict__.items()})
         return result
 
     @classmethod

tests/test_metadict.py

@@ -262,3 +262,21 @@ def test_warning_protected_key():
                                             ('100', False), (100, False), ((1, 2, 3), False)])
 def test_complies_variable_syntax(name: Any, expected: bool):
     assert complies_variable_syntax(name) == expected
+
+
+def test_copy():
+    cfg = MetaDict(a=1)
+    cfg2 = cfg.copy()
+    cfg2.a = 2
+    assert cfg.a == 1
+    assert cfg2.a == 2
+
+
+def test_copy_recursive():
+    cfg = MetaDict()
+    cfg2 = MetaDict(a=cfg)
+    cfg.a = cfg2
+    cfg3 = cfg.copy()
+    assert cfg3.a == cfg2
+    assert cfg3.a.a == cfg
+    assert cfg3.a.a.a == cfg2