组合数据类型练习，英文词频统计实例上

Posted 2020-10-08 133陈贝

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={\'小红\':\'60\',\'小明\':\'72\',\'小东\':\'98\',\'小华\':\'88\',\'小强\':\'91\'}

print(d.get(\'小红\'))
d.pop(\'小红\')
print(d.items())
d[\'小强\']=81
print(d.items())
for i in d:
    print(i)

结果如下图所示：

 

2)列表，元组，字典，集合的遍历。

list=[\'1\',\'2\',\'3\',\'4\',\'5\',\'6\']
tu=(\'01\',\'02\',\'03\',\'04\',\'05\',\'06\')
dic={\'01\':\'88\',\'02\':\'99\',\'03\':\'77\',\'04\':\'86\',\'05\':\'96\',\'06\':\'98\'}
jihe=set(list)

for i in list:
    print(i)
for i in tu:
    print(i)
for i in dic:
    print(i,dic[i])
for i in jihe:
    print(i)

结果如下图所示：

 

3)总结列表，元组，字典，集合的联系与区别。

       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。集合就是我们数学学的集合，没有什么特殊的定义。集合最好的应用是去重。集合没有特殊的表示方法，而是通过一个set函数转换成集合。最后一个是字典，字典存储键值对数据，字典最外面用大括号，每一组用冒号连起来，然后各组用逗号隔开，字典最大的价值是查询，通过键，查找值。

4)英文词频统计实例

1. (1)待分析字符串
2. (2)分解提取单词
3. 大小写 txt.lower()
4. 分隔符\'.,:;?!-_’
5. 单词列表
6. (3)单词计数字典
7. 

   A=\'\'\'The very thought of you  leaving my life
   Broke me down in tears.
   I took for granted all the love
   That you gave to me
   I know that\'s what I feared
   Don\'t go away.
   Every heart beat
   Every moment
   Everything I see is you
   Please forgive me.
   I\'m so sorry
   Don\'t say we\'re through
   Girl I need you  to be by my side
   Girl I need you  to open up my eyes
   Cause without you  where would I be
   Yes I need you
   Come back to me
   A kiss is not a kiss
   Without your lips kissing mine
   You bring me paradise
   I can\'t live if you took your love
   Away from me
   Without you I would die.
   Every second
   Every minute
   Every time I close my eyes.
   I could feel you
   So I want you
   To stay in my life
   Girl I need you  to be by my side
   Girl I need you  to open up my eyes
   Cause without you  where would I be
   Yes I need you
   Come back to me
   Every second,
   Every minute,
   Every time I close my eyes,
   I could feel you.
   So I want you
   To always be mine
   Girl I need you  to be by my side
   Girl I need you  to open up my eyes
   Cause without you  where would I be
   Yes I need you  come back to me
   Girl I need you  to be by my side
   Girl I need you  to open up my eyes
   Cause without you  where would I be
   Yes I need you  come back to me
   Girl I need you  to be by my side
   Girl I need you  to open up my eyes
   Cause without you  where would I be
   Yes I need you  come back to me\'\'\'
   
   A=A.lower()
   for i in \',.!\':
       A=A.replace(i,\' \')
   words=A.split(\' \')
   a=set(words)
   print(words)
   
   dic={}
   for i in a:
       dic[i]=0
   for i in words:
       dic[i]=dic[i]+1
   print(dic)

   

   结果如下图所示：