默认值字典

# from collections import defaultdict
#
# # 默认值字典
# dd = defaultdict(lambda: 0) # callable 可调用的, 字典是空的
#
# print(dd["张无忌"]) # 从字典向外拿数据. 字典是空的. key:callable()
# print(dd["宝宝"]) # 这里的[] 和get()不是一回事儿
# print(dd)


from collections import OrderedDict

dic = OrderedDict()  # 有序字典
dic["b"] = "哈哈"
dic['a'] = "呵呵"
print(dic)
print(dic.get("a"))
print(dic.values())
print(dic["a"])