组合数据类型练习，英文词频统计实例上

---

1. 字典实例：建立学生学号成绩字典，做增删改查遍历操作。
2. 列表，元组，字典，集合的遍历。
   总结列表，元组，字典，集合的联系与区别。
3. 英文词频统计实例
   • A.待分析字符串
   • B.分解提取单词
     • a.大小写 txt.lower()
     • b.分隔符'.,:;?!-_’
     • c.单词列表
   • C.单词计数字典

1.答：

a=('201506050011','201506050012','201506050013')
b=('80','90','100')
c=dict(zip(a,b))
print(c)

print('键:',c.keys())
print('值:',c.values())
print('201506050011的成绩:'+c['201506050011'])

c['201506050014']=95
print('增:',c)
c.pop('201506050014')
print('删:',c)
print('取值:'+c.get('201506050015','85'))

 

 

2.答：

s='python'
a='124455'
b=list(s)
c=tuple(s)
d=dict(zip(s,a))
e=set(a)
for i in (b,c,d,e):
    print(i)

总结列表，元组，字典，集合的联系与区别：

列表和元组类似，列表以中括号[]表示，元组以括号()表示，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，而元组一旦初始化就不能修改。

字典是使用键值存储，具有极快的查找速度，其中的key键必须是不可变对象，可以用元素元组引入，而值可以用列表的值引入，且它们没有顺序。

集合是一组key的集合，但不存储value，在集合中不存在重复的值，且它们是无序的。

 

3.答：

• A.待分析字符串

  s='''Beat It - Michael Jackson
  They Told Him Don't You Ever Come Around Here
  Don't Wanna See Your Face You Better Disappear
  The Fire's In Their Eyes And Their Words Are Really Clear
  So Beat It Just Beat It
  You Better Run You Better Do What You Can
  Don't Wanna See No Blood Don't Be A Macho Man
  You Wanna Be Tough Better Do What You Can
  So Beat It But You Wanna Be Bad
  Just Beat It Beat It Beat It Beat It
  No One Wants To Be Defeated
  Showin' How Funky Strong Is Your Fighter
  It Doesn't Matter Who's Wrong Or Right
  Just Beat It Beat It
  Just Beat It Beat It
  Just Beat It Beat It Just Beat It Beat It
  They're Out To Get You Better Leave While You Can
  Don't Wanna Be A Boy You Wanna Be A Man
  You Wanna Stay Alive Better Do What You Can
  So Beat It Just Beat It
  You Have To Show Them That You're Really Not Scared
  You're Playin' With Your Life This Ain't No Truth Or Dare
  They'll Kick You Then They Beat You
  Then They'll Tell You It's Fair
  So Beat It But You Wanna Be Bad
  Just Beat It Beat It Beat It Beat It
  No One Wants To Be Defeated
  Showin' How Funky Strong Is Your Fighter
  It Doesn't Matter Who's Wrong Or Right
  Just Beat It Beat It Beat It Beat It
  No One Wants To Be Defeated
  Showin' How Funky Strong Is Your Fighter
  It Doesn't Matter Who's Wrong Or Right
  Just Beat It Beat It Beat It Beat It Beat It...
  Beat It Beat It Beat It Beat It
  No One Wants To Be Defeated
  Showin' How Funky Strong Is Your Fighter
  It Doesn't Matter Who's Wrong Or Right
  Who Just Beat It Beat It Beat It Beat It
  No One Wants To Be Defeated
  Showin' How Funky Strong Is Your Fighter
  It Doesn't Matter Who's Wrong Or Who's Right
  Just Beat It Beat It Beat It Beat It
  No One Wants To Be Defeated
  Showin' How Funky Strong Is Your Fighter
  It Doesn't Matter Who's Wrong Or Right
  Just Beat It Beat It Beat It Beat It
  No One Wants To Be Defeated
  Showin' How Funky Strong Is Your Fighter
  It Doesn't Matter Who's Wrong Or Right
  Just Beat It
  -'''

  B.分解提取单词

  s=s.lower()
  for i in ',.?!-':
      s=s.replace(i,' ')
  s=s.replace('\n',' ')
  s=s.split(' ')
  print(s)

        A和B图略，参照上一篇博文。

 

• C.单词计数字典

  a=set(s)
  for i in a:
      print(i+'出现的次数',s.count(i))