Question

我正在尝试对字符串列表进行排序，在打印b c直到z之前，它应首先打印所有“x” 这段代码有效，但我希望它在函数风格中让我更了解它

words.sort(key=lambda x: (x[0] != 'x', x))

Answer 1

这都与两个事实有关。

元组按索引0排序，然后按索引1排序，然后按索引N排序。
按升序（向前）顺序排序时，在True之前进行错误排序。

def sort_x_as_first(words):
    things_to_actually_sort = []
    for word in words:
        if word[0] == 'x':
            things_to_actually_sort.append((False, word))
        else:
            things_to_actually_sort.append((True, word))
    # Our things_to_actually_sort has a bunch of tuples where they are
    # (True, word) if the word does not start with x
    # (False, word) if the word does start with x
    temp_sorted_things = sorted(things_to_actually_sort)
    # When applying the sort, the False go first, then the True values after since tuples sort by index 0 first.  For each group of False (the x's) those are then sorted by word.  Same goes for the group of True values.
    sorted_things = []
    for thing in temp_sorted_things:
        sorted_things.append(thing[1])

    return sorted_things

任何人都可以在python中使这个功能？让我明白

1 个答案: