英文词频统计预备，组合数据类型练习

Posted 2020-10-08 陆倩霞

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。

lo=\'\'\'An empty street An empty house. 
A hole inside heart, 
I\'m all alone and the rooms,
Are getting smaller. 
I wonder how I wonder why? 
I wonder where they are 
The days,we had 
The,songs we sang together 
And oh! my love 
I\'m,holding on forever 
Reaching for a love 
That seems so far 
So I say a litter prayer ,
No my dream will take me there.
Where the skies are blue to see you 
once again my love 
Overseas from coast to coast 
Find a place I love the most 
Where the fields are green 
To see you once again 
My love! 
I Try to read I go to work.
I\'m laughing with my friends. 
But I can\'t stop to keep myself 
From thinking 
I wonder how I wonder why 
I wonder where they are 
The days we had, 
The songs we sang togetther 
And oh! my love 
I\'mholding on forever. 
Reaching for a love 
That seems so far 
So,I say a litter prayer 
No my dream will take me there 
Where the skies are blue to see you 
once again my love 
Overseas from coast to coast 
Find a place I love the most 
Where the fields are green? 
To see you once again 
To hold you in my arms 
To promise my love 
To tell you from my heart 
You are all I\'m thinking of 

Reaching for a love 
That seems.so far 
So I say a litter prayer 
No my dream will take me there 
Where the skies are blue to see you 
once again my love 
Overseas from coast to coast, 
Find a place I love the most, 
Where the fields are green. 
To see you once again 
My love! 
And hope my dream will take me there, 
Where the skies are blue to see you. 
once again my love. 
Overseas from coast to coast, 
Find a place I love the most 
Where the fields are green 
To see you once again 
My love!\'\'\'
s=lo.lower()
s=s.replace(\',\',\' \')
s=s.replace(\'.\',\' \')
s=s.replace(\'?\',\' \')
s=s.replace(\'!\',\' \')
print(s)
print(s.count(\'love\'))
a=s.split(\' \')
print(a)

 

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。

grade=list(\'1223321232123\')
print(\'作业评分列表:\\n\',grade)
grade.append(\'3\')
print(\'增加一个评分3：\\n\',grade)
grade.pop(1)
print(\'删除下标为1的评分：\\n\',grade)
grade[3]=\'4\'
print(\'改下标为3的评分为4：\\n\',grade)
grade.insert(5,\'3\')
print(\'在下标为5的评分插入评分3：\\n\',grade)
number=grade.index(\'3\')
print(\'第一个3分的下标为：\',number)
a=grade.count(\'1\')
print(\'1分的同学有:\',a,\'个\')
a=grade.count(\'3\')
print(\'3分的同学有:\',a,\'个\')

3.简要描述列表与元组的异同。

答：元组是不可变的。即一旦被赋值，值就不能修，元组是通过圆括号中用逗号分隔的。
   列表中的元素是在方括号中，列表是可变的，创建了一个列表，可以对其进行添加，删除，查询。