Python中的json.loads和json.load方法截断嵌套json对象的问题及其解决方案

在python中使用json.loads或json.load方法将json字符串转换为python对象时，可能会遇到嵌套json对象被截断的问题。以下是一个示例代码：

import json

foo = '{"root":"cfb-score","children":{"gamecode":{"attribute":"global-id"},"gamestate":{"attribute":"status-id","attribute":"status","attribute":"quarter","attribute":"minutes","attribute":"seconds","attribute":"team-possession-id","attribute":"yards-from-goal","attribute":"down","attribute":"distance","attribute":"segment-number","attribute":"active-state"},"gametype":{"attribute":"type","attribute":"detail"},"stadium":{"attribute":"name","attribute":"city","attribute":"state"},"visiting-team:team-name":{"attribute":"alias"},"visiting-team:team-code":{"attribute":"global-id"},"visiting-team:team-rank":{"attribute":"rank"}}}'

bar = json.loads(foo)
print(json.dumps(bar))

当运行这段代码时，会发现所有最低级别的“children”都被截断或覆盖，除了最后一个。

2. 解决方案

3. 使用json.load方法时，确保json字符串中的键都是唯一的。

   JSON对象可以转换为python字典，这意味着json字符串中的键不能重复。如果有多个键具有相同的值，则只会保留最后一个键。

4. 在json字符串中使用数组存储具有相同值的键。

   如果您需要在json字符串中存储具有相同值的键，则可以使用数组来存储这些键。例如，以下json字符串使用数组存储了“gamestate”下的属性：

{"root":"cfb-score","children":{"gamecode":{"attribute":"global-id"},"gamestate":{"attributes":["status-id","status","quarter","minutes","seconds","team-possession-id","yards-from-goal","down","distance","segment-number","active-state"]},"gametype":{"attribute":"type","attribute":"detail"},"stadium":{"attribute":"name","attribute":"city","attribute":"state"},"visiting-team:team-name":{"attribute":"alias"},"visiting-team:team-code":{"attribute":"global-id"},"visiting-team:team-rank":{"attribute":"rank"}}}

3. 使用第三方json解析库，如ujson或simplejson。

   这些库可能会更好地处理嵌套json对象，并且可能不会出现截断问题。

以下是一些代码示例，演示了解决方案2和3：

# 解决方案2：使用数组存储具有相同值的键

foo = '{"root":"cfb-score","children":{"gamecode":{"attribute":"global-id"},"gamestate":{"attributes":["status-id","status","quarter","minutes","seconds","team-possession-id","yards-from-goal","down","distance","segment-number","active-state"]},"gametype":{"attribute":"type","attribute":"detail"},"stadium":{"attribute":"name","attribute":"city","attribute":"state"},"visiting-team:team-name":{"attribute":"alias"},"visiting-team:team-code":{"attribute":"global-id"},"visiting-team:team-rank":{"attribute":"rank"}}}'

bar = json.loads(foo)
print(json.dumps(bar))

# 解决方案3：使用第三方json解析库

import ujson

foo = '{"root":"cfb-score","children":{"gamecode":{"attribute":"global-id"},"gamestate":{"attribute":"status-id","attribute":"status","attribute":"quarter","attribute":"minutes","attribute":"seconds","attribute":"team-possession-id","attribute":"yards-from-goal","attribute":"down","attribute":"distance","attribute":"segment-number","attribute":"active-state"},"gametype":{"attribute":"type","attribute":"detail"},"stadium":{"attribute":"name","attribute":"city","attribute":"state"},"visiting-team:team-name":{"attribute":"alias"},"visiting-team:team-code":{"attribute":"global-id"},"visiting-team:team-rank":{"attribute":"rank"}}}'

bar = ujson.loads(foo)
print(ujson.dumps(bar))