带有列表参数的 Python sum() 函数
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Python sum() function with list parameter
提问by Ro Mc
I am required to use the sum()function in order to sum the values in a list. Please note that this is DISTINCT from using a forloop to add the numbers manually. I thought it would be something simple like the following, but I receive TypeError: 'int' object is not callable.
我需要使用该sum()函数来对列表中的值求和。请注意，这与使用for循环手动添加数字不同。我认为它会像下面这样简单，但我收到TypeError: 'int' object is not callable.
numbers = [1, 2, 3]
numsum = (sum(numbers))
print(numsum)
I looked at a few other solutions that involved setting the start parameter, defining a map, or including forsyntax within sum(), but I haven't had any luck with these variations, and can't figure out what's going on. Could someone provide me with the simplest possible example of sum()that will sum a list, and provide an explanation for why it is done the way it is?
我查看了一些其他解决方案，这些解决方案涉及设置 start 参数、定义映射或在 中包含for语法sum()，但我对这些变化没有任何运气，也无法弄清楚发生了什么。有人能给我提供一个最简单的例子来sum()总结一个列表，并解释为什么它是这样完成的吗？
采纳答案by flornquake
Have you used the variable sumanywhere else? That would explain it.
您是否sum在其他任何地方使用过该变量？这样就可以解释了。
>>> sum = 1
>>> numbers = [1, 2, 3]
>>> numsum = (sum(numbers))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'int' object is not callable
The name sumdoesn't point to the function anymore now, it points to an integer.
这个名字sum现在不再指向函数，它指向一个整数。
Solution: Don't call your variable sum, call it totalor something similar.
解决方案：不要调用你的变量sum，调用它total或类似的东西。
回答by jasper
numbers = [1, 2, 3]
numsum = sum(list(numbers))
print(numsum)
This would work, if your are trying to Sum up a list.
如果您正在尝试总结一个列表，这将起作用。
回答by Bob McCormick
In the last answer, you don't need to make a list from numbers; it is already a list:
在最后一个答案中，您不需要从数字中列出；它已经是一个列表：
numbers = [1, 2, 3]
numsum = sum(numbers)
print(numsum)
