总结列表，元组，字典，集合区别
列表是可变的对象，可进行动态的增加、删除、更新，用[]表示。
元组和列表在结构上没有什么区别，唯一的差异在于元组是只读的，不能修改元组用“()”表示。
字典是存储键值对数据的对象，字典的元素都是无序的，且键不能相同，可以通过键，找到值，字典最外面用大括号，每一组用冒号连接起来。
集合相当于字典的键，也是一个无序不重复的元素集，用一对{}表示。
1.列表，元组，字典，集合的遍历
a = list(‘nihao‘) # 列表的遍历 print(a) for i in a: print(i) b = tuple(‘12323‘) # 元组的遍历 print(b) for i in b: print(i) c = set(‘kjkjhg‘) # 集合的遍历 print(c) for i in c: print(i) d = {‘v‘: 44, ‘c‘: 233, ‘q‘: 67} # 字典的遍历 print(d) for i in d: print(i, d[i])
2.英文词频统计：
noStr = ‘‘‘Beautiful girls all over the world. I could be chasing but my time will be wasted. They got nothin＇ on you baby. Nothin＇ on you baby. They might say hi and I might say hey. But you shouldn＇t worry about what they say. Coz they got nothin＇ on you baby. Nothin＇ on you baby. I know you feel where I＇m coming from. So baby regardless of the things in my past everything I＇ve done. Cause you and I know it was just for fun, I was on the carrousel I just spun around. With no direction, no intentions It all ended. It＇s so much nonsense, it＇s on my conscience I＇m thinking ＂maybe I should get it out＂ And I don＇t wanna sound redundant But I was wondering, if there was something that you wanna know But never mind that, we should let it go Coz we don＇t wanna be a T.V. episode And all the bad thoughts, just let em go, go, go Beautiful girls all over the world. I could be chasing but my time will be wasted. They got nothin＇ on you baby. Nothin＇ on you baby. They might say hi and I might say hey. But you shouldn＇t worry about what they say. Coz they got nothin＇ on you baby. Nothin＇ on you baby. I know you feel where I＇m coming from. So baby regardless of the things in my past everything I＇ve done. Cause you and I know it was just for fun, I was on the carrousel I just spun around. With no direction, no intentions. It all ended. It＇s so much nonsense, it＇s on my conscience I＇m thinking ＂maybe I should get it out＂ And I don＇t wanna sound redundant But I was wondering,‘‘‘ noStr = noStr.lower()#大小写转换 for i in ‘‘‘,.!?‘‘‘: noStr=noStr.replace(i,‘ ‘)#空格代替符号 noStr1 = noStr.split()#出去两边空格 result = {} for word in set(noStr1): result[word] = noStr1.count(word) print(result)
原文：https://www.cnblogs.com/Zengl/p/9753471.html