组合数据类型练习，英文词频统计实例上

Posted 2020-10-08

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 = {‘Bob‘: 75, ‘Michael‘: 95, ‘Tracy‘: 85}
   #zeng
   d[‘Tom‘]=88
   print(d)
   #del
   d.pop(‘Michael‘)
   print(d)
   del(d[‘Tracy‘])
   print(d)
   #gai
   d[‘Tom‘]=90
   print(d)
   #cha
   print(d.get(‘Bob‘))
   
   print(d.keys())
   print(d.get(‘Michael‘,66))
   print(d.values())
   print(d.items())
   print(d.pop(‘Bob‘,55))

   

2. 列表，元组，字典，集合的遍历。

   l=list(‘1124564641321564‘)
   t=tuple(‘124856421574212‘)
   s=set(‘121542121213210‘)
   d=[‘Bob‘, ‘Tom‘]
   i=[75, 90]
   di=dict(zip(d,i))
   
   for i in l:
       print(i,end=‘/‘)
   print()                      
   for i in t:
       print(i,end=‘/‘)
   print()  
   for i in s:
       print(i,end=‘/‘)
   print()  
   for i in di:
       print(i,di[i])