刪除元素

1. 刪除字典中某的特定元素用 del，但要刪除所有元素則要利用字典物件導向成員 clear。

   [dywang@deyu zzz]$ cat dict4.py
   #!/usr/bin/python3
   # coding: utf-8
   
   uid = { 'dywang':1000, 'david':2346, 'linda':1324 }
   print("uid =", uid)
   del uid['dywang']
   print("uid =", uid)
   uid.clear()
   print("uid =", uid)
   

2. 執行結果：del 刪除用戶 dywang，clear() 清除所有元素，uid 變成一個空字典。

   [dywang@deyu zzz]$ ./dict4.py 
   uid = {'dywang': 1000, 'david': 2346, 'linda': 1324}
   uid = {'david': 2346, 'linda': 1324}
   uid = {}