组合数据类型练习，英文词频统计实例上
Posted 林丹宜
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1.字典实例：建立学生学号成绩字典，做增删改查遍历操作
d={\'201506050084\':100,\'201506050081\':101,\'201506050082\':102,\'201506050083\':100}
print(d)
d[\'201506050085\']=100
print(d)
del(d[\'201506050084\'])
print(d)
d.pop(\'201506050081\')
print(d)
d.keys()
print(d.keys())
print(d.values())
print(d.get(\'201506050081\',\'无此值\'))
print(d.items())
2.列表，元组，字典，集合的遍历。
ls=list(\'201506050084\') print(ls) for i in ls: print(i) tu=tuple(\'201506050084\') print(tu) for i in tu: print(i) se=set(\'201506050084\') print(se) for i in se: print(i) d={\'201506050084\':1,\'201506050081\':2,\'201506050082\':3,\'201506050085\':4} print(d) for i in d: print(i,d[i])
总结列表，元组，字典，集合的联系与区别。
（1）列表是任意对象的序列。列表用方括号表示。
（2）将一组值打包到一个对象中，称为元组。元组用圆括号表示。元组和列表的大部分操作相同。但是，列表是不固定的，可以随时插入，删除；而元组一旦确认就不能够再更改。所以，系统为了列表的灵活性，就需要牺牲掉一些内存；而元组就更为紧凑。
（3）与列表和元组不同，集合是无序的，也不能通过索引进行访问。此外，集合中的元素不能重复。
（4）字典就是一个关联数组或散列表，其中包含通过关键字索引的对象。用大括号表示。与集合相比，通过关键字索引，所以比集合访问方便。
3.英文词频统计实例
（1）待分析字符串
（2）分解提取单词
大小写 txt.lower()
分隔符\'.,:;?!-_’
单词列表
d=\'\'\'If I had to live my life without you near me The days would all be empty The nights would seem so long With you I see forever oh so clearly I might have been in love before But it never felt this strong Our dreams are young And we both know they\'ll take us where we want to go Hold me now Touch me now I don\'t want to live without you Nothing\'s gonna change my love for you You ought to know by now how much I love you One thing you can be sure of I\'ll never ask for more than your love Nothing\'s gonna change my love for you You ought to know by now how much I love you The world may change my whole life through But nothing\'s gonna change my love for you If the road aheadis not so easy, Our love will lead the way for us Just like a guiding star I\'ll be there for you if you should need me You don\'t have to change a thing I love you just the way you are So come with me and share the view I\'ll help you see forever too Hold me now Touch me now I don\'t want to live without you Nothing\'s gonna change my love for you You ought to know by now how much I love you One thing you can be sure of I\'ll never ask for more than your love\'\'\' a=d.lower() b=d.replace(\',\',\' \') c=d.replace(\'!\',\' \') d=d.split(\' \') print(\'I出现的次数：\',d.count(\'I\')) print(\'you出现的次数：\',d.count(\'you\')) print(\'改变后的英文歌曲：\',d)
3.单词计数字典
d=\'\'\'If I had to live my life without you near me The days would all be empty The nights would seem so long With you I see forever oh so clearly I might have been in love before But it never felt this strong Our dreams are young And we both know they\'ll take us where we want to go Hold me now Touch me now I don\'t want to live without you Nothing\'s gonna change my love for you You ought to know by now how much I love you One thing you can be sure of I\'ll never ask for more than your love Nothing\'s gonna change my love for you You ought to know by now how much I love you The world may change my whole life through But nothing\'s gonna change my love for you If the road aheadis not so easy, Our love will lead the way for us Just like a guiding star I\'ll be there for you if you should need me You don\'t have to change a thing I love you just the way you are So come with me and share the view I\'ll help you see forever too Hold me now Touch me now I don\'t want to live without you Nothing\'s gonna change my love for you You ought to know by now how much I love you One thing you can be sure of I\'ll never ask for more than your love\'\'\' d=d.lower() for i in \',.""\': d=d.replace(i,\' \') print(d) words=d.split(\' \') print(words)
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