英文词频统计预备，组合数据类型练习

Posted 2020-10-08 106洪瑜

1实例: 下载一首英文的歌词或文章，将所有,.？！等替换为空格，将所有大写转换为小写，统计某几个单词出现的次数，分隔出一个一个的单词。

g=‘‘‘Say something, I‘m giving up on you.
I‘ll be the one, if you want me to.
Anywhere, I would‘ve followed you.
Say something, I‘m giving up on you.
And I am feeling so small.
It was over my head
I know nothing at all.
And I will stumble and fall.
I‘m still learning to love
Just starting to crawl.
Say something, I‘m giving up on you.
I‘m sorry that I couldn‘t get to you.
Anywhere, I would‘ve followed you.
Say something, I‘m giving up on you.
And I will swallow my pride.
You‘re the one that I love
And I‘m saying goodbye.
Say something, I‘m giving up on you.
And I‘m sorry that I couldn‘t get to you.
And anywhere, I would have followed you.
Oh-oh-oh-oh say something, I‘m giving up on you.
Say something, I‘m giving up on you.
Say something...‘‘‘
g=g.lower()     // 小写
g=g.replace(‘,‘,‘ ‘)    // ，改为‘ ‘  
g=g.replace(‘.‘,‘ ‘)    //.改为‘ ‘
g=g.split(‘ ‘)       分隔
g.count(‘something‘)      统计个数
print(g)

 

2列表实例：由字符串创建一个作业评分列表，做增删改查询统计遍历操作。例如，查询第一个3分的下标，统计1分的同学有多少个，3分的同学有多少个等。

f=list(‘221211322313212222132‘)
f.append(‘2‘)     //添加
f.pop(0)      //删除
f.insert(3,‘3‘)     // 插入
list(range(5))      //遍历
f.index(‘3‘)       //第一个3分下标
f.count(‘1‘)      //1分同学的个数
f.count(‘3‘)     //3分中学的个数

3简要描述列表与元组的异同。

列表是一种有序的序列，正向递增、反向递减序号，可以随时添加和删除其中的元素。没有长度限制、元素类型可以不同。

元组与列表类似，不同之处在于元组的元素不能修改。元组使用小括号，列表使用方括号。