如何添加字典的特定元素

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sleeps=[{"summaryId ": "x209bf59-59b0c5a8-585c ", 
     "validation ": "AUTO_TENTATIVE ", 
     "durationInSeconds ": 22620, 
     "startTimeInSeconds ": 1504757160, 
     "awakeDurationInSeconds ": 900, 
     "startTimeOffsetInSeconds ": -14400, 
     "deepSleepDurationInSeconds ": 8160, 
     "lightSleepDurationInSeconds ": 13560}, 
     {"summaryId ": "x209bf59-59b0c5a8-23a0 ", 
     "validation ": "AUTO_TENTATIVE ", 
     "durationInSeconds ": 9120, 
     "startTimeInSeconds ": 1504757160, 
     "awakeDurationInSeconds ": 300, 
     "startTimeOffsetInSeconds ": -14400, 
     "deepSleepDurationInSeconds ": 1680, 
     "lightSleepDurationInSeconds ": 7140} 
     ] 

res = sum([x["durationInSeconds"] for x in sleeps]) 
print(res)

这是投掷Keyerror。如何添加字典的特定元素

来源

2017-09-10 pranav Kumar

要修改的关键在你的字典定义

"durationInSeconds " 
       ^

来源

2017-09-10 17:57:35 LotusH

散列有多余的空间，比较需要空格考虑。如果它们彼此相邻印刷，可能更容易发现差异：

"durationInSeconds " 
"durationInSeconds"

第一个有一个尾随空白。

>>> hash(s1) == hash(s2) 
False 
>>> s1 == s2 
False

所以他们在不尊重彼此相等，这也解释了KeyError。要修复它，您需要删除字典中的尾部空白，或者查找带有尾部空白的键。例如：

>>> res = sum([x["durationInSeconds "] for x in sleeps]) 
>>> print(res) 
31740

来源

2017-09-10 20:43:06 MSeifert

如何添加字典的特定元素

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