python字符串的翻转实现的两种方法

str1 = "hello world!"

print(str1[::-1])

from functools import reduce

str1 = "hello world!"

print(reduce(lambda  x, y : y+x, str1))

str1 = "123455"

def fun(string):

    print("%s" % string == string[::-1] and "YES" or "NO")

if __name__ == '__main__':

    fun(str1)