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I made some calculations with my data and saved it into a csv file. In the file I have a cell with this string:

"[array([3, 3, 3]), array([3, 3, 3]), array([3, 3, 3]), array([3, 3, 3]), array([3])]"

I want to convert it to a valid numpy array. Tried some functions but got no luck yet.

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    Why do you think this is a reasonable way to serialize your array? Commented Sep 14, 2021 at 9:53
  • @juanpa.arrivillaga What do you mean? Commented Sep 14, 2021 at 9:55
  • Why do you think that putting this data into a text file like this, basically just dumping the string representation of a list, is a reasonable way to serialize your data? Why didn't you use something like JSON, or pickle? Commented Sep 14, 2021 at 9:55

1 Answer 1

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If you have pandas, use pd.eval:

>>> import pandas as pd
>>> from numpy import array
>>> pd.eval("[array([3, 3, 3]), array([3, 3, 3]), array([3, 3, 3]), array([3, 3, 3]), array([3])]")
[array([3, 3, 3]), array([3, 3, 3]), array([3, 3, 3]), array([3, 3, 3]), array([3])]
>>>
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  • I get the error: "array" is not a supported function Commented Sep 14, 2021 at 9:55
  • @Nikita Edited my answer with working code Commented Sep 14, 2021 at 9:55
  • If I ran it in Spyder I get the error "ValueError: unknown type object" But if I run it in the CMD everything's working right. Do you know what might be the issue? Commented Sep 14, 2021 at 10:11
  • Update: Just had to specify the engine as Python Commented Sep 14, 2021 at 10:26

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