from collections.abc import Mapping, MutableMapping

#Python
dict_data = dict()

print(isinstance(dict_data, Mapping))
print(isinstance(dict_data, MutableMapping))

import copy

student_dict = {
    '小明': {'school': '兰州大学'},
    '小红': {'school': '北京大学'},
}

# 浅拷贝
new_dict_1 = student_dict.copy()
new_dict_1['小明']['school'] = 'Python学院'
print(new_dict_1)
print(student_dict)

# 深拷贝
print('-' * 30)
new_dict_2 = copy.deepcopy(student_dict)
new_dict_2['小红']['school'] = 'Java学院'
print(new_dict_2)

# fromkeys:根据key批量设置value
print('-' * 30)
student_name_list = ['大熊', '小静']
new_dict_3 = dict.fromkeys(student_name_list, {'address': '北京'})
print(new_dict_3)

# get方法：
print('-' * 30)
print(student_dict.get('小明'))
print(student_dict.get('小强', '当前学生不存在...'))

# items方法：
print('-' * 30)
for key, value in student_dict.items():
    print(key, value)
    
# setdefault方法：查询不存在的可以，并且设置value
print('-' * 30)
default = student_dict.setdefault('双双', {'school': '天津大学'})
print(default)
print(student_dict)

# update方法：支持接收迭代对象
print('-' * 30)
student_dict.update({'夏洛':{'school': '北京航天航空大学'}})
print(student_dict)

#### 不建议直接继承字典和列表
class MyDict(dict):
    def __setitem__(self, key, value):
        super().__setitem__(key, value * 2)

my_dict = MyDict(one=1)
print(my_dict)

my_dict['one'] = 1
print(my_dict)

from collections import UserDict

class MyUserDict(UserDict):
    def __setitem__(self, key, value):
        super().__setitem__(key, value * 2)

        
my_dict = MyUserDict(one=2)
print(my_dict)

# 集合创建
set_data_1 = set('abcde')
print(set_data_1)

set_data_2 = set(['a', 'b', 'c', 'd', 'e'])
print(set_data_2)

# 添加元素
set_data_1.add('f')
print(set_data_1)


# 不可变集合
set_data_3 = frozenset('abcde')
print(set_data_3)

# update方法
set_data_4 = set('123')
set_data_1.update(set_data_4)
print(set_data_1)

# difference方法
set_data_5 = set('123')
result = set_data_1.difference(set_data_5)
print(result)

# 集合交并集运算符号
#     |:并集
#     &:交集
#     -:差集

# issubset方法：判断当前结合是否是另外一个集合的一部分
print(set_data_5.issubset(set_data_1))