[英]Python function to make a list of numbers from user input
I am to write code so that when I run the program, user input can write a couple of numbers and return the value of those numbers negated. 我要编写代码,以便在我运行程序时,用户输入可以编写几个数字并返回取反的那些数字的值。 Example, user calls the function with this:
例如,用户使用以下命令调用函数:
neg([1, 2, -3, 54, -9])
And that will result in this output: 这将导致以下输出:
[-1, -2, 3, -54, 9]
I'm having trouble finding the right coding to solve this issue. 我无法找到正确的编码来解决此问题。 I'm grateful for all help.
我很感谢所有帮助。
You can multiple the values of each item by -1
to get the negative. 您可以将每个项目的值乘以
-1
来获得负数。
>>> mylist = [-1,2,-3,-4.6,0]
>>> neg_list = [-x for x in mylist]
>>> neg_list
[1, -2, 3, 4.6, 0]
You can see that this works for both positive and negative values within the list. 您可以看到这对列表中的正值和负值都适用。 It keeps
0
at 0
保持
0
为0
lst = [1, 2, -3, 54, -9]
def neg(lst):
for i in range(len(lst)):
lst[i] *= -1
return lst
print neg(lst)
All you need to do is get the "inverse" of each item in the list, map
will do just that for you: 您需要做的就是获取列表中每个项目的“逆”,
map
会为您完成:
In [1]: map(lambda item: -item, [1, 2, -3, 54, -9])
Out[1]: [-1, -2, 3, -54, 9]
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