Python访问嵌套字典值

Question

我要将JSON转换为字典，然后直接访问值。这是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"
  }
}

我可以很好地访问单个嵌套字典，但是当我尝试使用多个键访问嵌套字典时，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saved_named密钥的值？

Answer 1

您打错了字。您放置了len=5 cap=5 [[1 2] [2 3] [3 4] [1 4] [1 5]] len=5 cap=5 [[2 3] [3 4] [1 4] [1 5] [1 5]] 而不是saved_named。