Python 如何添加dict的特定元素
这会抛出一个Python 如何添加dict的特定元素,python,dictionary,python-3.6,keyerror,Python,Dictionary,Python 3.6,Keyerror,这会抛出一个键错误要修改的键在dict定义中有冗余空间 sleeps=[{"summaryId ": "x209bf59-59b0c5a8-585c ", "validation ": "AUTO_TENTATIVE ", "durationInSeconds ": 22620, "startTimeInSeconds ": 1504757160, "awakeDurationInSeconds ": 900,
键错误
要修改的键在dict定义中有冗余空间
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)
哈希和比较将空格考虑在内。如果它们相邻打印,可能更容易发现差异:
"durationInSeconds "
^
第一个有一个尾随空格
"durationInSeconds "
"durationInSeconds"
因此,它们在任何方面都不相等,这也解释了KeyError
。要修复它,您需要删除字典中的尾随空格,或者查找带有尾随空格的键。例如:
>>> hash(s1) == hash(s2)
False
>>> s1 == s2
False
>>> res = sum([x["durationInSeconds "] for x in sleeps])
>>> print(res)
31740