您可以将其缩短为
def rotate(strg,n): return strg[n:] + strg[:n]
并简单地使用负索引来“向右”旋转：
>>> rotate("hello", 2)'llohe'>>> rotate("hello", -1)'ohell'>>> rotate("hello", 1)'elloh'>>> rotate("hello", 4)'ohell'>>> rotate("hello", -3)'llohe'>>> rotate("hello", 6) # same with -6: no change if n > len(strg)'hello'如果即使在超过字符串长度后仍要保持旋转，请使用
def rotate(strg,n): n = n % len(strg) return strg[n:] + strg[:n]
所以你得到
>>> rotate("hello", 1)'elloh'>>> rotate("hello", 6)'elloh'
