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Editorial Team
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Asked: 2026-06-10T21:20:24+00:00

I’m trying to parse items in a text file and store them into a

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I’m trying to parse items in a text file and store them into a list. The data looks something like this:

[(0, 0, 0), (1, 0, 0), (2, 0, 0), (3, 0, 0), (4, 0, 0), (5, 0, 0), (6, 0, 0)]
[(10, 3, 1), (11, 3, 1), (12, 3, 1), (13, 3, 1), (13, 4, 1)]
[(10, 3, 5), (11, 3, 5), (12, 3, 5), (13, 3, 5), (13, 4, 5), (13, 5, 5), (13, 6, 5)]
[(6, 13, 5), (7, 13, 5), (8, 13, 5), (8, 14, 5), (7, 14, 5), (6, 14, 5), (6, 14, 6)]

I was able to strip the “[” and “]” but couldn’t store the rest of information into list as such format:
(x, y, z). Any help?

 def dataParser(fileName):
    zoneList=[]; zone=[]
    input=open(fileName,"r")

    for line in input:
        vals = line.strip("[")
        newVals = vals.strip("]\n")

        print newVals
        v=newVals[0:9]
        zone.append(v)

    input.close()
    return zone
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1 Answer

  1. Editorial Team

    In this particular case, you can use ast.literal_eval:

    >>> with open("list.txt") as fp:
...     data = [ast.literal_eval(line) for line in fp if line.strip()]
... 
>>> data
[[(0, 0, 0), (1, 0, 0), (2, 0, 0), (3, 0, 0), (4, 0, 0), (5, 0, 0), (6, 0, 0)], [(10, 3, 1), (11, 3, 1), (12, 3, 1), (13, 3, 1), (13, 4, 1)], [(10, 3, 5), (11, 3, 5), (12, 3, 5), (13, 3, 5), (13, 4, 5), (13, 5, 5), (13, 6, 5)], [(6, 13, 5), (7, 13, 5), (8, 13, 5), (8, 14, 5), (7, 14, 5), (6, 14, 5), (6, 14, 6)]]

    It’s the “safe” version of eval. It’s not as general, though, for precisely that reason. If you’re generating this input, you might want to look into a different way to save your data (“serialization”), whether using pickle or something like JSON — there are lots of examples of using both you can find on SO and elsewhere.

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