17.python内置函数2

python内置函数1：https://www.cnblogs.com/raitorei/p/11813694.html

# max,min高级玩法

# l=[1,3,100,-1,2]

# print(max(l))

# print(min(l))

#

#

# print(list(zip(('a','n','c'),(1,2,3))))

# print(list(zip(('a','n','c'),(1,2,3,4))))

# print(list(zip(('a','n','c','d'),(1,2,3))))

#

# p={'name':'alex','age':18,'gender':'none'}

# print(list(zip(p.keys(),p.values())))

# # print(list(p.keys()))

# # print(list(p.values()))

#

# print(list(zip(['a','b'],'12345')))

# l=[1,3,100,-1,2]

# print(max(l))

# print(min(l))

# age_dic={'alex_age':18,'wupei_age':20,'zsc_age':100,'lhf_age':30}

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

#

# #默认比较的是字典的key

# # print(max(age_dic))

#

# for item in zip(age_dic.values(),age_dic.keys()): #[(18,'alex_age')  (20,'wupeiqi_age') () () ()]

#     print(item)

#

# print('=======>',list(max(zip(age_dic.values(),age_dic.keys()))))

# l=[

#     (5,'e'),

#     (1,'b'),

#     (3,'a'),

#     (4,'d'),

# ]

# # l1=['a10','b12','c10',100] #不同类型之间不能进行比较

# l1=['a10','a2','a10'] #不同类型之间不能进行比较

# print(list(max(l)))

# print('--->',list(max(l1)))

# l=[1,3,100,-1,2]

# print(max(l))

# dic={'age1':18,'age2':10}

# print(max(dic)) #比较的是key

# print(max(dic.values())) #比较的是key，但是不知道是那个key对应的

#

# print(max(zip(dic.values(),dic.keys()))) #结合zip使用

#

#

# people=[

#     {'name':'alex','age':1000},

#     {'name':'wupei','age':10000},

#     {'name':'yuanhao','age':9000},

#     {'name':'linhaifeng','age':18},

# ]

# # max(people,key=lambda dic:dic['age'])

# print('值：',max(people,key=lambda dic:dic['age']))

# ret=[]

# for item in people:

#     ret.append(item['age'])

# print(ret)

# max(ret)

# 对应ascll的值

# print(chr(97))

# print(ord('a'))

# print(pow(3,3))  #3**3

# print(pow(3,3,2))  #3**3%2

# 逆序

# l=[1,2,3,4]

# print(list(reversed(l)))

# print(l)

# round() 方法返回浮点数x的四舍五入值。

# print(round(3.5))

# set() 函数创建一个无序不重复元素集，可进行关系测试，删除重复数据，还可以计算交集、差集、并集等。

# print(set('hello'))

# 切片

# l='hello'

# s1=slice(3,5)

# s2=slice(1,4,2)

# # print(l[3:5])

# print(l[s1])

# print(l[s2])

# print(s2.start)

# print(s2.stop)

# print(s2.step)

# 排序

# l=[3,2,1,5,7]

# l1=[3,2,'a',1,5,7]

# print(sorted(l))

# # print(sorted(l1)) #排序本质就是在比较大小，不同类型之间不可以比较大小

# people=[

#     {'name':'alex','age':1000},

#     {'name':'wupei','age':10000},

#     {'name':'yuanhao','age':9000},

#     {'name':'linhaifeng','age':18},

# ]

# print(sorted(people,key = lambda dic:dic['age']))

# name_dic={

#     'abyuanhao': 11900,

#     'alex':1200,

#     'wupei':300,

# }

# print(sorted(name_dic))

#

# print(sorted(name_dic,key=lambda key:name_dic[key]))

#

# print(sorted(zip(name_dic.values(),name_dic.keys())))

# print(str('1'))

# print(type(str({'a':1})))

# dic_str=str({'a':1})

# print(type(eval(dic_str)))

# l=[1,2,3,4]

# print(sum(l))

# print(sum(range(5)))

#

# 查看类型

# print(type(1))

#

# msg='123'

#

# if type(msg) is str:

#     msg=int(msg)

#     res=msg+1

#     print(res)

# vars() 函数返回对象object的属性和属性值的字典对象。

# def test():

#     msg='撒旦法阿萨德防撒旦浪费艾丝凡阿斯蒂芬'

#     print(locals())

#     print(vars())

# test()

# print(vars(int))

# 调用其他文件

#import------>sys----->__import__()

# import test

# test.say_hi()

# import 'test'#报错

# module_name='test'

# m=__import__(module_name)

# m.say_hi()