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#1 Created at ... [Delete] [Delete and Lock User]

def is_palindrome(n):
    return    str(n) == str(n)[::-1]

#2 Created at ... [Delete] [Delete and Lock User]

难道不用 filter() 这是这节重点

#3 Created at ... [Delete] [Delete and Lock User]

filter是在外部的高阶函数使用，廖大已经给出了！

#4 Created at ... [Delete] [Delete and Lock User]

n[::-1]就是从后面开始取？

#5 Created at ... [Delete] [Delete and Lock User]

大佬!![::-1]这个切片骚操作您是在哪学到的?求指教..

#6 Created at ... [Delete] [Delete and Lock User]

@IalwayszuobutIneverdie 切片那节有介绍。a[::2]表示每个两个取一次，a[::-1]表示取a的倒序。