为什么在使用 sum() 函数时会出现 'int' obj

问题描述

我试图弄清楚为什么在范围上使用 sum 函数时会出错.

I'm trying to figure out why I'm getting an error when using the sum function on a range.

代码如下:

data1 = range(0, 1000, 3)
data2 = range(0, 1000, 5)
data3 = list(set(data1 + data2)) # makes new list without duplicates
total = sum(data3) # calculate sum of data3 list's elements
print total

这是错误:

line 8, in <module> total2 = sum(data3)
TypeError: 'int' object is not callable

我找到了这个错误的解释:

I found this explanation for the error:

在 Python 中，可调用"通常是一个函数.该消息意味着您将数字(一个>int")视为一个函数(一个可调用")，所以Python不知道该做什么，所以它>停止.

In Python a "callable" is usually a function. The message means you are treating a number (an >"int") as if it were a function (a "callable"), so Python doesn't know what to do, so it >stops.

我还读到 sum() 能够用于列表，所以我想知道这里出了什么问题?

I've also read that sum() is capable of being used on lists, so I'm wondering what is going wrong here?

我刚刚在 IDLE 模块中尝试过，效果很好.但是，它在 python 解释器中不起作用.有什么想法吗?

I just tried it in an IDLE module and it worked fine. However, it doesn't work in the python interpreter. Any ideas on how that can be?

推荐答案

您可能将sum"函数重新定义为整数数据类型.所以它正确地告诉你整数不是你可以传递范围的东西.

You probably redefined your "sum" function to be an integer data type. So it is rightly telling you that an integer is not something you can pass a range.

要解决此问题，请重新启动您的解释器.

To fix this, restart your interpreter.

Python 2.7.3 (default, Apr 20 2012, 22:44:07) 
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> data1 = range(0, 1000, 3)
>>> data2 = range(0, 1000, 5)
>>> data3 = list(set(data1 + data2)) # makes new list without duplicates
>>> total = sum(data3) # calculate sum of data3 list's elements
>>> print total
233168

如果你隐藏 sum 内置，你会得到你看到的错误

If you shadow the sum builtin, you can get the error you are seeing

>>> sum = 0
>>> total = sum(data3) # calculate sum of data3 list's elements
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'int' object is not callable

另外，请注意 sum 将在 set 上正常工作，无需将其转换为 list

Also, note that sum will work fine on the set there is no need to convert it to a list

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