交作业啦（看完评论团的结果）

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

def is_palindrome(n):

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

output = filter(is_palindrome,range(1,1000)) print(list(output))

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

牛

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

[：：-1]这个是对全体每-1取一个这个怎么理解呢。。。

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

倒序

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

切片啊！完全没想到

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

在Python Shell窗口运行此程序，会报错: File "<pyshell#91>", line 2, in fn return str(n) == str(n)[::-1] TypeError: 'str' object is not callable

str(123)也运行不了。但在Python另一交互模式（黑背景）中却可以运行。

请问，这是什么原因啊？