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I am trying to read an array from file which I made earlier and then assign it to variable. But now i ran into a problem. When i assigned that file content to variable, it became string instead of array. how do i convert that back to an array ?

file.txt content:

[(0, 0.2, ),(0, 0.1, ),(0.2, 0.2, ),(0.2, 0.2, ),(0.4, 0.2, ),]

my code:

valid_outputs = f=open("fileName.txt","r")
if(f.mode == 'r'):
    valid_outputs = f.read()
Martijn Pieters
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Welly Winata
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  • That's not an array, it's a Python `list` with `tuple` values. Not sure how you managed to produce that exact string however, as the Python representation would not include the trailing commas. – Martijn Pieters Aug 16 '19 at 15:07

3 Answers3

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You could use ast.literal_eval() on the string:

>>> ast.literal_eval('[(0, 0.2, ),(0, 0.1, ),(0.2, 0.2, ),(0.2, 0.2, ),(0.4, 0.2, ),]')
[(0, 0.2), (0, 0.1), (0.2, 0.2), (0.2, 0.2), (0.4, 0.2)]
Sam Mason
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NPE
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0

Slightly convoluted, but without any packages:

>>> [tuple([float(i) for i in block.split(",")[:2]]) for block in valid_outputs.replace(")]", "").replace("[(", "").split("),(")]
[(0.0, 0.2), (0.0, 0.1), (0.2, 0.2), (0.2, 0.2), (0.4, 0.2)]
tituszban
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x = None
with open("file.txt", "r") as f:
    x = eval(f.read())

print x
Sam Daniel
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