展平雪花中的嵌套JSON

import json

def flatten_json(y):
    out = {}

    def flatten(x, name=''):
        if type(x) is dict:
            for a in x:
                flatten(x[a], name + a + '_')
        elif type(x) is list:
            i = 0
            for a in x:
                flatten(a, name + str(i) + '_')
                i += 1
        else:
            out[name[:-1]] = x

    flatten(y)
    return out

# 示例嵌套JSON对象
nested_json = {
    "name": "John",
    "age": 30,
    "address": {
        "street": "123 Main St",
        "city": "Anytown",
        "zipcode": "12345"
    },
    "contacts": [
        {"type": "email", "value": "john@example.com"},
        {"type": "phone", "value": "555-1234"}
    ]
}

# 展平嵌套JSON对象
flattened_json = flatten_json(nested_json)
print(json.dumps(flattened_json, indent=4))