ValueError while trying to split line extracted from file

Question

with open(st) as file:

    for line in file:

        line = line.rstrip()

        name, species, homeworld = line.split("t")

        characters.append(StarWarsCharacter(name, species, homeworld))

I’m trying to extract data, but I just get a value error:

ValueError:
name, species, homeworld = line.split("t")
ValueError: not enough values to unpack (expected 3, got 1)

Asked By: user20247957

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Source

Answer 1

First of all, the name of the file should be a string, the it should be "st". Second, the error is clear: it means that the split returns only one token, but you expected 3. Then, the file you are trying to read is not separated by "t". In fact, trying to reproduce:

script.py:

with open("st") as file:
    for line in file:
        line = line.rstrip()
        ame, species, homeworld = line.split("t")

Note that i didnt include the last line because I don’t have these structs.

st:

pluto   dog homeworld

Running the command python script.py i don’t have any error, because my file is correctly separated by "t".

Answered By: ma4strong

Answer 2

You are expecting that each line can be split into 3 parts based on the separator t.
But if it is not true you will get this error.

Additionally as commented by CrazyChucky, this can also happen if the line is empty.

Consider this example:

line = "a; b; c"
p1, p2, p3 = line.split(';')
p1, p2, p3 = line.split(',') # ValueError: not enough values to unpack (expected 3, got 1)

The line cannot be split into three part based on the separator ,.

Answered By: kgkmeekg

ValueError while trying to split line extracted from file

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