如何从 python 中保存为文本文件的 arrays 列表中导入和提取元素

Question

I have a.txt file, which is a list of arrays. I want to import that file and extract elements of that list of arrays and work with them. when I use

with open('filename.txt') as f:
        list1 = eval(f.read())

which works well when I want to import a list of numbers, does not work when the elements are arrays. It gives

NameError: name 'array' is not defined

Problem is perhaps with the eval() function not working well with arrays? Could you help me import this list of arrays?

Answer 1

If the file content is, for example:

array([1,2,3])

...then...

from numpy import array

with open('filename.txt') as f:
    a = eval(f.read())
    print(a)
    print(type(a))

...will produce...

[1 2 3]
<class 'numpy.ndarray'>