diff --git a/python_base.py b/python_base.py
index 9b5e605..9fab081 100644
--- a/python_base.py
+++ b/python_base.py
@@ -285,7 +285,7 @@ class Dict(dict):
         def __missing__(self, key):
             self[key] = []
             return self[key]
-    dct = dict()
+    dct = Dict()
     dct["foo"].append(1)    # 这有点类似于collections.defalutdict
     dct["foo"]              # [1]