python - Python 中的元组比较

Question

根据 this :

Tuples and lists are compared lexicographically using comparison of corresponding elements. This means that to compare equal, each element must compare equal and the two sequences must be of the same type and have the same length.

If not equal, the sequences are ordered the same as their first differing elements. For example, cmp([1,2,x], [1,2,y]) returns the same as cmp(x,y). If the corresponding element does not exist, the shorter sequence is ordered first (for example, [1,2] < [1,2,3]).

如果我没理解错的话

(a, b, c) < (d, e, f)

如果

则为真

a < d and b < e and c < f

为什么

(1, 2, 3) < (2, 0, 4)

给出真？

我怎样才能做这样的比较？

Answer 1

你的理解有问题。这不是 和 - 这是级联比较。

a < d or (a == d and b < e) or (a == d and b == e and c < f)

另一种理解任意长度元组的方法...

def tuple_less_than(tuple1, tuple2):
    for item1, item2 in zip(tuple1, tuple2):
        if item1 != item2:
            return item1 < item2
    return len(tuple1) < len(tuple2)