['__class__', '__contains__', '__delattr__', '__delitem__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__',

'__getattribute__', '__getitem__', '__gt__', '__hash__', '__init__', '__iter__', '__le__', '__len__', '__lt__', '__ne__',

 '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__setitem__', '__sizeof__', '__str__',

 '__subclasshook__',

 'clear', 'copy', 'fromkeys', 'get', 'items', 'keys', 'pop', 'popitem', 'setdefault', 'update', 'values']

my_dict = {

    'user1':"zhangsan",

    'user2':"lisi",

    'user3':"wangermazi",

}

print(my_dict)

# {'user2': 'lisi', 'user3': 'wangermazi', 'user1': 'zhangsan'},无序输出

my_dict['user4'] = "xiaotaoqi"

print(my_dict)

# {'user3': 'wangermazi', 'user4': 'xiaotaoqi', 'user2': 'lisi', 'user1': 'zhangsan'},增加

my_dict['user1'] = "ZHANGSAN"

print(my_dict)

# {'user3': 'wangermazi', 'user2': 'lisi', 'user4': 'xiaotaoqi', 'user1': 'ZHANGSAN'},修改

# 删除三法pop，del,popitem

my_dict.pop("user1")

print(my_dict)

# {'user2': 'lisi', 'user3': 'wangermazi', 'user4': 'xiaotaoqi'}

del my_dict['user2']

print(my_dict)

# {'user3': 'wangermazi', 'user4': 'xiaotaoqi'}

my_dict.popitem()

print(my_dict)

# {'user2': 'lisi', 'user3': 'wangermazi', 'user1': 'ZHANGSAN'}

city = {

    '':{

        'beijing':{

            'chaoyang':"xizhimen",

            'haidian':'xibeiwang',

            'tongzhou':'shuxi'

        }

    },

    '':"shanghai",

    '':"liaoning"

}

print(city['']['beijing']['haidian'])

# xibeiwang

print(city.keys())

# dict_keys(['1', '2', '3'])

print(city.values())

# dict_values([{'beijing': {'haidian': 'xibeiwang', 'tongzhou': 'shuxi', 'chaoyang': 'xizhimen'}}, 'shanghai', 'liaoning'])

print(city.items())

# dict_items([('3', 'liaoning'), ('2', 'shanghai'), ('1', {'beijing': {'tongzhou': 'shuxi', 'chaoyang': 'xizhimen', 'haidian': 'xibeiwang'}})])

person = dict({'name':"zhangsan","age":18,"gender":"M"})

print(person)

print(dir(person))

# ['__class__', '__contains__', '__delattr__', '__delitem__', '__dir__', '__doc__',

# '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__gt__', '__hash__',

#  '__init__', '__iter__', '__le__', '__len__', '__lt__', '__ne__', '__new__', '__reduce__',

#  '__reduce_ex__', '__repr__', '__setattr__', '__setitem__', '__sizeof__', '__str__',

# '__subclasshook__',

#  'clear', 'copy', 'fromkeys', 'get', 'items', 'keys', 'pop', 'popitem', 'setdefault', 'update', 'values']

# for k,v in person.items():

#     print(k,v)

# gender M

# age 18

# name zhangsan

#

# person.clear()

# print(person)

# {}

print(person.copy())

# {'gender': 'M', 'name': 'zhangsan', 'age': 18}

print(person.fromkeys(person))

# {'name': None, 'gender': None, 'age': None}

print(person.get('age'))

#

print(person.get('age1'))

# None

print(person.keys())

# dict_keys(['name', 'gender', 'age'])

print(person.values())

# dict_values(['zhangsan', 18, 'M'])

print(person.items())

# dict_items([('gender', 'M'), ('name', 'zhangsan'), ('age', 18)])

# print(person.pop('name'))

# zhangsan

#  ,',  'pop', 'popitem', 'setdefault', 'update']

# print(person.popitem())

# {'gender': 'M', 'age': 18}

# print(person.setdefault('age'))

#

# print(person.setdefault('job'))

# None

# print(person)

# {'name': 'zhangsan', 'age': 18, 'job': None, 'gender': 'M'}

print(person.update({"age":56,'name':"William"}))

# {'age': 56, 'name': 'William', 'gender': 'M'}

print(person.__contains__("age"))

# True

print("*"*50)

# print(person.__delitem__('name'))

# None

# {'age': 56, 'gender': 'M'}

print(person.__getitem__('age'))

#

print(person)