dic = {‘name‘: ‘wangys‘,‘age‘: 18}
dic[‘sex‘] = ‘male‘
print(dic)
# {‘name‘: ‘wangys‘, ‘age‘: 18, ‘sex‘: ‘male‘}

dic = {‘name‘: ‘wangys‘,‘age‘: 18}
dic[‘name‘] = ‘wc‘
print(dic)

# {‘name‘: ‘wc‘, ‘age‘: 18}

dic = {‘name‘: ‘wangys‘,‘age‘: 18}
dic.setdefault(‘sex‘,‘male‘)
print(dic)
# {‘name‘: ‘wangys‘, ‘age‘: 18, ‘sex‘: ‘male‘}

dic = {‘name‘: ‘wangys‘,‘age‘: 18}
dic.setdefault(‘name‘,‘wc‘)
print(dic)
# {‘name‘: ‘wangys‘, ‘age‘: 18}

dic = {‘name‘: ‘wangys‘,‘age‘: 18}
ret = dic.pop(‘age‘)
print(ret)
print(dic)

# 18
# {‘name‘: ‘wangys‘}

dic = {‘name‘: ‘wangys‘,‘age‘: 18}
ret = dic.pop(‘male‘)
print(ret)
print(dic)
# KeyError: ‘male‘

dic = {‘name‘: ‘wangys‘,‘age‘: 18}
del dic[‘name‘]
print(dic)
del dic[‘male‘]
print(dic)

# {‘age‘: 18}
# KeyError: ‘male‘

dic = {‘name‘: ‘wangys‘,‘age‘: 18}
dic.clear()
print(dic)
#{}

dic = {‘name‘: ‘wangys‘,‘age‘: 18}
print(dic.popitem())
print(dic)

# (‘age‘, 18)
# {‘name‘: ‘wangys‘}

dic = {‘name‘: ‘wangys‘,‘age‘: 18}
dic[‘name‘] = ‘wc‘
print(dic)
# {‘name‘: ‘wc‘, ‘age‘: 18}

dic1 = {‘name‘: ‘wangys‘,‘age‘: 18}
dic2 = {‘name‘: ‘wc‘,‘sex‘: ‘male‘}
dic1.update(dic2)
print(dic1)
# {‘name‘: ‘wc‘, ‘age‘: 18, ‘sex‘: ‘male‘}

dic1 = {‘name‘: ‘wangys‘,‘age‘: 18}
print(dic1[‘name‘])
# wangys

dic1 = {‘name‘: ‘wangys‘,‘age‘: 18}
print(dic1[‘male‘])
# KeyError: ‘male‘

dic1 = {‘name‘: ‘wangys‘,‘age‘: 18}
ret1 = dic1.get(‘name‘)
ret2 = dic1.get(‘male‘)
ret3 = dic1.get(‘male‘,‘改键不存在‘)
print(ret1,ret2,ret3)
# wangys None 改键不存在

dic1 = {‘name‘: ‘wangys‘,‘age‘: 18}
for item in dic1:
    print(item)
# name
# age

dic1 = {‘name‘: ‘wangys‘,‘age‘: 18}
ret = dic1.keys()
print(ret)
# dict_keys([‘name‘, ‘age‘])

dic1 = {‘name‘: ‘wangys‘,‘age‘: 18}
ret = dic1.keys()
for key in ret:
    print(key)

dic1 = {‘name‘: ‘wangys‘,‘age‘: 18}
ret = dic1.values()
print(ret)
#dict_values([‘wangys‘, 18])

dic1 = {‘name‘: ‘wangys‘,‘age‘: 18}
ret = dic1.items()
print(ret)
# dict_items([(‘name‘, ‘wangys‘), (‘age‘, 18)])