python学习-33 max和min函数的高级使用

1.简单比较

age_dic={'age1456':15,'age2':16,'xiaohong_age':12,'xiaoming_age4':18,'age5':10}

print(max(age_dic))              # key值进行比较。比较时一位一位比较

print(max(age_dic.values()))     # values 值比较

运行结果：

xiaoming_age4
18

process finished with exit code 0

2.高级方法

age_dic={'age1456':15,'age2':16,'xiaohong_age':12,'xiaoming_age4':18,'age5':10}

for item in zip(age_dic.values(),age_dic.keys()):
    print(item)             # 返回每个值

print(max(zip(age_dic.values(),age_dic.keys())))

运行结果：

(15, 'age1456')
(16, 'age2')
(12, 'xiaohong_age')
(18, 'xiaoming_age4')
(10, 'age5')
[18, 'xiaoming_age4']

process finished with exit code 0

3.终极方法

a =[
    {'name':'aa','age':18},
    {'name':'bb','age':21},
    {'name':'xm','age':10}
]

print(max(a,key=lambda dic:dic['age']))

'''
就相当于：
ret = []
for item in a:
    ret.append(item['age'])
print(ret)
max(ret)
'''

运行结果：

{'name': 'bb', 'age': 21}

process finished with exit code 0