[英]How to retrieve max key and corresponding value from the tuple in the dictionary based on the first argument of the tuple
例如,如果給定的字典如下:
dic = {('K1', 'S1'): 4.999997655759467,
('k1', 'K2'): 6.1999036349232375,
('K1', 'K4'): 7.999999999999876,
('K2', 'K1'): 6.199940422452897,
('K2', 'K3'): 7.999999999999876,
('K2', 'K5'): 6.199962763954776,
('K3', 'K2'): 6.199997321675397,
('K3', 'K6'): 7.999998023783301,
('K3', 'S2'): 9.999999999999911,
('K4', 'S1'): 9.999999999999911,
('K4', 'K1'): 6.199999975663285,
('K4', 'K5'): 6.19999999303405,
('K5', 'K2'): 6.199989058277423,
('K5', 'K4'): 7.999999999999876,
('K5', 'K6'): 7.999950953156936,
('K6', 'S2'): 9.999999999999911,
('K6', 'K3'): 7.999641214892367,
('K6', 'K5'): 6.19980050493078}
而所需的output如下:
{('K1', 'K4'): 7.999999999999876,
('K2', 'K3'): 7.999999999999876,
('K3', 'S2'): 9.999999999999911,
('K4', 'S1'): 9.999999999999911,
('K5', 'K4'): 7.999999999999876,
('K6', 'S2'): 9.999999999999911}
我實現了下面的function,可惜只能獲取value,並沒有獲取到對應的key。
def getMaxForX(number):
return max([v for k, v in dic.items() if k[0] == number])
我不完全理解字典的最大鍵和值的概念?
請建議我如何解決這個問題。
我猜你只是附加值(v)而不是鍵(k)。 所以更新你的return
邏輯
return max([k, v for k, v in Q_values.items() if k[0] == number])
所以你想按鍵的第一個元素( K1, K2, K3, ...
)進行分組,然后根據值找到每個組的最大值:
>>> from itertools import groupby
>>> sortkey = lambda i: i[0][0].lower()
>>> groups = groupby(sorted(dic.items(), key=sortkey), key=sortkey)
>>> result = dict(max(v, key=lambda i: i[1]) for k, v in groups)
>>> result
{('K1', 'K4'): 7.999999999999876, ('K2', 'K3'): 7.999999999999876, ('K3', 'S2'): 9.999999999999911, ('K4', 'S1'): 9.999999999999911, ('K5', 'K4'): 7.999999999999876, ('K6', 'S2'): 9.999999999999911}
注意:我在分組時使用了sortkey
鍵,因為您的示例中的一個鍵具有不同的大小寫。 如果這只是一個錯字,你可以省略它。
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