增加元素

1. 字典 uid 增加用戶 peter。

   pyuser@deyu:~/zzz$ cat dict2.py 
   #!/usr/bin/python
   
   uid = { 'dywang':1000, 'david':2346, 'linda':1324 }
   print("uid =", uid)
   uid['peter'] = 1202
   print("uid =", uid)
   

2. 執行結果：uid 字典從 3 個用戶增加為 4 個用戶。

   pyuser@deyu:~/zzz$ ./dict2.py 
   uid = {'dywang': 1000, 'david': 2346, 'linda': 1324}
   uid = {'dywang': 1000, 'david': 2346, 'linda': 1324, 'peter': 1202}