Use Python to implement any integer in reverse

This is a long time to learn C did a practice exercise, the topic of the request is probably the user input three-digit reverse output, such as user input 123, and then the program should output the result is 321. If you encounter user input 100, then the program should output 1. And then I'm going to extend this program to accommodate three-digit or three-digit numbers or less.

So in this problem, my first idea is to find a way to take the user input of the number to open him, and then put in the list inside. Then take it out and stitch it up again. So I wrote the front code as follows:

#!/usr/bin/env python#-*-coding:utf-8-*-number = Int (raw_input ("Please input a number:")) numlist = []while 1:    if Nu Mber = = 0: Break    numlist.append (number%) Number    = NUMBER/10

This time we print the value of numlist to get a list of the equal length and number of digits.

And then the stitching process, here I think of Python's higher order function, reduce (), the first parameter of the function receives a function for processing the list, and the second parameter receives the list to be processed.

This means:

Reduce (f, [X1, x2, X3, x4]) = f (f (f (x1, x2), x3), x4)

So the processing function writes this:

def f (x, y):    return x * ten + y

最终的代码：


#!/usr/bin/env python#-*-coding:utf-8-*-number = Int (raw_input ("Please input a number:")) numlist = []result = 0while 1:    if number = = 0: Break    numlist.append (number%) Number    = Number/10def f (x, y):    return x * + YP Rint reduce (f, numlist)

PS: Reprint please indicate the source of the article.

Use Python to implement any integer in reverse