Python:使用FOR循环插入字典 [英] Python: Inserting into dictionary using FOR Loop

问题描述

我在论坛上进行了搜索，无法理解是否可以使用以下结构将新条目插入到我的Python词典中...而无需将其转换为列表.

i have searched through the forum and can't understand if i can use the following construct to insert new entries into my Python Dictionary...without turning it into a list.

for x in range(3):    
   pupils_dictionary = {}
   new_key =input('Enter new key: ')
   new_age = input('Enter new age: ')
   pupils_dictionary[new_key] = new_age
print(pupils_dictionary)

输出如下:

Enter new key: Tim
Enter new age: 45
Enter new key: Sue
Enter new age: 16
Enter new key: Mary
Enter new age: 15
{'Mary': '15'}

为什么只有玛丽:15进来，而没有其他人进来?

Why does ONLY Mary:15 go in, and none of the others?

谢谢/

推荐答案

是因为您这样做 studentss_dictionary = {}

Its because you do pupils_dictionary = {}

在循环中，在每个循环中，其值都将重置为{}

Inside your loop, on every loop, its value get reset to {}

建议:

使用raw_input代替输入

use raw_input instead of input

因此此代码应该有效:

pupils_dictionary = {}

for x in range(3):    
    new_key = raw_input('Enter new key: ')
    new_age = raw_input('Enter new age: ')
    pupils_dictionary[new_key] = new_age
print(pupils_dictionary)

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