递归解决全排列问题

l = ['a', 'b', 'c']


def f(lt, start, end):
    if start == end:
        print(lt)
    else:
        for i in range(start, end+1):
            lt[start], lt[i] = lt[i], lt[start]
            f(lt, start+1, end)
            lt[start], lt[i] = lt[i], lt[start]


if __name__ == '__main__':
    f(l, 0, 2)

运行结果：