如何创建列表列表 [英] how to create a list of lists

问题描述

我的Python代码每次循环都会生成一个列表:

My Python code generates a list everytime it loops:

list = np.genfromtxt('temp.txt', usecols=3, dtype=[('floatname','float')], skip_header=1)

但是我想保存每个-我需要一个列表列表吗?

But I want to save each one - I need a list of lists right?

所以我尝试了:

list[i] = np.genfromtxt('temp.txt', usecols=3, dtype=[('floatname','float')], skip_header=1)

但是Python现在告诉我未定义列表".我不确定如何定义它.此外，列表列表是否与数组相同?

But Python now tells me that "list" is not defined. I'm not sure how I go about defining it. Also, is a list of lists the same as an array??

谢谢！

推荐答案

使用附加方法，例如:

lst = []
line = np.genfromtxt('temp.txt', usecols=3, dtype=[('floatname','float')], skip_header=1)
lst.append(line)

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