17.python内置函数2

Posted 2020-11-30 星空月零

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()