如何在 for 循环中编写 json 文件？

Question

如何存储 for 循环的结果？如何在循环内创建 json 文件？在每次迭代的这个循环中，我打印 2 个值 print(a1,a2)。现在我想将所有这些值存储在一个 json 文件中。

Answer 1

你不应该在循环的里面写json文件，你应该建立一个字典或字典列表，然后用json.dump()写它

import json

# initialize the dictionary
my_dict = {}

# loop to emulate your data structure
for i in range(10):
    # assign a1 and a2
    a1 = i
    a2 = i ** 2 # just so the value is different than the key for demonstration
    # set a1 as the key and a2 as the value
    my_dict[a1] = a2

# use json.dump to write the file
with open('./square.json', 'w') as file:
    json.dump(my_dict, file, indent=4)

输出（square.json）：

{
    "0": 0,
    "1": 1,
    "2": 4,
    "3": 9,
    "4": 16,
    "5": 25,
    "6": 36,
    "7": 49,
    "8": 64,
    "9": 81
}