[英]python nested dictionary comprehension bug?
下面的嵌套/雙字典理解似乎給出了錯誤的結果:
>>> { k:v for k in range(2) for v in 'abc' }
{0: 'c', 1: 'c'}
比較的元組:
>>> [ (k,v) for k in range(2) for v in 'abc' ]
[(0, 'a'), (0, 'b'), (0, 'c'), (1, 'a'), (1, 'b'), (1, 'c')]
與dict()
行為相同:
>>> dict( (k,v) for k in range(2) for v in 'abc' )
{0: 'c', 1: 'c'}
還是我在這里犯了概念上的錯誤?
也許我打算這樣做:
>>> { k1: { k2 : (k1,k2) for k2 in range(2) } for k1 in range(3) }
...
{0: {0: (0, 0), 1: (0, 1)},
1: {0: (1, 0), 1: (1, 1)},
2: {0: (2, 0), 1: (2, 1)}}
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