Message373514
In your first example, `min([(-5, 2), (0, 2)])` the min() function compares the two tuples and finds that the first one is lexicographically smaller:
py> (-5, 2) < (0, 2)
True
so (-5, 2) is considered the minimum. In the second example, using the key function compares 2 with 2, but since they are equal, the *first* tuple wins and is considered the minimum, and so using the key function doesn't change the result.
In your third example, after reversing the list, you have `min([(0, 2), (-5, 2)])` and the min() function compares the two tuples and finds the *second* tuple is the smaller:
py> (0, 2) < (-5, 2)
False
But in the fourth example, using the key function, yet again the comparison compares 2 with 2 and finds them equal, and so the *first* tuple wins and (0, 2) is declared the minimum.
When using the key function, only the second item of the tuple is looked at; the first item is ignored. So the difference between 0 and -5 is irrelevant, and the tie is decided by which element was seen first. |
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Date |
User |
Action |
Args |
2020-07-11 04:32:06 | steven.daprano | set | recipients:
+ steven.daprano, terry.reedy, Calvin Davis |
2020-07-11 04:32:06 | steven.daprano | set | messageid: <1594441926.52.0.833852741382.issue41276@roundup.psfhosted.org> |
2020-07-11 04:32:06 | steven.daprano | link | issue41276 messages |
2020-07-11 04:32:06 | steven.daprano | create | |
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