Update python_base.py

Author: 0xkookoo

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]