how to convert lists in string in numpy array to a numpy array

Question

I have this numpy array ['[-30,30]' '[-30,30]' '[-30,30]' '[-30,30]'] But I would like to convert it into [[-30,30] [-30,30] [-30,30] [-30,30]]

How can I do that?

Thanks in advance!

What exactly is the input? Certainly not a numpy array. Here you have a single string embedded in a list — mozway
– mozway, Commented Apr 7, 2022 at 12:36
Input is ['[-30,30]' '[-30,30]' '[-30,30]' '[-30,30]'] ,it is a numpy array consist of strings and output should look like [[-30,30] [-30,30] [-30,30] [-30,30]] just a numpy array — mesut_comak
– mesut_comak, Commented Apr 7, 2022 at 12:38
So input is ['[-30,30][-30,30][-30,30][-30,30]']? 'a' 'b' in python is 'ab' — mozway
– mozway, Commented Apr 7, 2022 at 12:39
That's the same, run it in a python shell. Thus my question, your input is unclear. Do you then mean "['[-30,30]' '[-30,30]' '[-30,30]' '[-30,30]']"? Or ['[-30,30]', '[-30,30]', '[-30,30]', '[-30,30]']? — mozway
– mozway, Commented Apr 7, 2022 at 12:41
this is the input ['[-30,30]' '[-30,30]' '[-30,30]' '[-30,30]'] — mesut_comak
– mesut_comak, Commented Apr 7, 2022 at 12:44

I'mahdi · Accepted Answer · 2022-04-07 13:34:52Z

1

You can use ast.literal_eval like below:

>>> import ast
>>> lst = np.array(['[-30,30]','[-30,30]','[-30,30]', '[-30,30]'])

>>> type(lst[0])
numpy.str_

>>> type(ast.literal_eval(lst[0]))
list

>>> np.array(list(map(ast.literal_eval, lst)))
array([[-30,  30],
       [-30,  30],
       [-30,  30],
       [-30,  30]])

answered Apr 7, 2022 at 13:34

I'mahdi

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