Python练习小题

倒序一个整数

例如 1234 --> 4321

def intrev(i):
    a = []
    sum = 0
    while(i>0):
        a.append(i%10)
        i = (i-i%10)/10
    for i in range(len(i)):
        sum=sum*10+a[i]
    return sum       

进阶版去掉列表

def intrev(i):
    sum = 0
    while (i>0):
        sum = sum*10+i/10
        i = i//10
    return sum

Pyhton魔性版 通过字符串倒序

def intrev(i):
    return int(str(i)[::-1])