标签：abc div for http 数据 数据类型 对象 .com can
1.总结列表，元组，字典，集合的联系与区别：
列表：list [, ,] list是一种有序的序列，可以随时添加和删除元素，元素类型可以不同。
元组： tuple[‘‘ ,‘‘ ]元组一旦创建，便不能修改,只能做读取操作。
字典：dict {key:value,} dict的key 不能重复，必须是不可变对象。
集合：set {,,} 也是一组key的集合，key不能重复。
2.列表，元组，字典，集合的遍历。
列表：
li=list(‘abcde‘) print(li) for lis in li: print(lis)
运行结果：
元组：
classmates=["Michale","Bob","Tracy","李三","Tracy",56] print(classmates) for tuple in classmates: print(tuple)
运行结果：
字典：
classmates={"Bob":75,"Michael":95,"Tracy":85}
print(classmates)
for dic in classmates:
print(dic)
运行结果：
集合：
s={1,2,3,4,4,6}
print(s)
for set in s:
print(set)
运行结果：
英文词频统计：
str=‘The steps that we left behind‘ ‘ Your lonely eyes stare back at mine‘ ‘ In pictures from that time‘ ‘ I hold my heart,closing my eyes‘ ‘ I see your smile,lies behind‘ ‘ In this place,you entered my life‘ ‘ How I wish,you were still mine‘ ‘ I know that if I see you again‘ ‘ Beside that cafe we met‘ ‘ I＇d forget about the past‘ ‘ Lose track of time,with you‘ ‘ Talking about our lives‘ ‘ To show you a whole new side of me‘ ‘ And see the changes we＇ve made,can we‘ ‘ Be more than we have been‘ ‘ Start our story again‘ ‘ All I can say,is tell you just one thing‘ ‘ 好久不见‘ ‘ I hold my heart,closing my eyes‘ ‘ I see your smile,lies behind‘ ‘ In this place,you entered my life‘ ‘ How I wish,you were still mine‘ ‘ I know that if I see you again‘ ‘ Beside that cafe we met‘ ‘ I＇d forget about the past‘ ‘ Lose track of time,with you‘ ‘ Talking about our lives‘ ‘ To show you a whole new side of me‘ ‘ And see the changes we＇ve made,can we‘ ‘ Be more than we have been‘ ‘ Start our story again‘ ‘ All I can say,is tell you just one thing‘ ‘ 好久不见‘ print(str.lower()) print(str.count("you")) list=str.split() print(list) for song in list: print(song,list.count(song))
运行结果：
标签：abc div for http 数据 数据类型 对象 .com can
原文地址：https://www.cnblogs.com/cx1234/p/9691012.html
