[英]Python: How to combine the results of for loop into one output?
numbers = [1, 2, 3]
for number in numbers:
number = number * 2
#For the output I will get:
2
4
6
如何修改代码,以便不使用print语句就可以合并结果(例如[2,4,6])?
使用列表理解:
[num*2 for num in numbers]
>>> numbers = [1, 2, 3]
>>> [num*2 for num in numbers]
[2, 4, 6]
>>>
创建新的List类型变量result
并通过list append()
方法向其中添加值。
演示:
>>> numbers = [1, 2, 3]
>>> result = []
>>> for i in numbers:
... result.append(i*2)
...
>>> result
[2, 4, 6]
>>>
如果要将结果收集到一个列表中,只需创建一个列表append
每个列表append
到列表上:
numbers = [1, 2, 3]
doubles = []
for number in numbers:
double = number * 2
doubles.append(double)
…或更紧凑地说,使用列表理解来做同样的事情:
numbers = [1, 2, 3]
doubles = [number * 2 for number in numbers]
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