Python访问嵌套字典值

Question

我将JSON转换为字典，然后直接访问值。以下是JSON：

{
  "timestamp": {
    "format": "%Y-%m-%d %H:%M:%S"
  },
  "status": {
    "grok_pattern": " status=%{NUMBER:status:int}"
  },
  "SQLite3_memory_bytes": {
    "table": "stats_memory_metrics",
    "saved_name": "sqlite3_memory_bytes"
  },
  "jemalloc_resident": {
    "table": "stats_memory_metrics"
  }
}

我可以访问单个嵌套字典，但当我尝试访问具有多个键的嵌套字典时，会出现错误：

with open('/tmp/metrics.json') as json_file:
    patterns = json.load(json_file)
print(patterns['jemalloc_resident']['table'])
print(patterns['timestamp']['format'])
print(patterns['SQLite3_memory_bytes']['saved_named'])
>> stats_memory_metrics
>> %Y-%m-%d %H:%M:%S
>> Traceback (most recent call last):
>>   File "test.py", line 12, in <module>
        print(patterns['SQLite3_memory_bytes']['saved_named'])
   KeyError: 'saved_named'

如何访问已保存的_命名键的值

Answer 1

你打错了。您将saved_named替换为saved_name