17.python内置函数2

# 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()