反转数字

def reverse(x):
	if -10<x<10:
		return x
	str_x = str(x)
	if str_x[0] !="-":
		str_x = str_x[::-1]
		x = int(str_x)
	else:
		str_x = str_x[1:][::-1]
		x = int(str_x)
		x = -x
	return x if -2147483648<x<2147483647 else 0

假设我们的环境只能存储 32 位有符号整数，其数值范围是 [−2^31,  2^31 − 1]。根据这个假设，如果反转后的整数溢出，则返回 0。

if __name__ == '__main__':
	reverse_int = reverse(-120)
	print(reverse_int)

反转字符串

def reverseString(s):
 s = [i for i in s]
 n = len(s) // 2
 length = len(s)
 for i in range(n):
     temp = s[i]
     s[i] = s[length-1-i]
     s[length-i-1] = temp
 return "".join(s)
if __name__ == '__main__':
	reverse_int = reverseString('hello')
	print(reverse_int)

参考: https://blog.csdn.net/ANNILingMo/article/details/80579993