Python replace an index of list separated by split function

Question

I have a long array that looks something like this :

arr=["5;V;K;4406632419324152;0123;172;9;0;0;06012020;3000"
"2;M;K;4406553211445698;0123;124;2;0;0;06012020;2000"
"3;M;K;5412115956124218;0123;236;3;0;1;06012020;2000"
"4;V;K;4406621015140546;0123;131;9;0;0;06012020;3000"]

Each index is a line from a text file. The content is not important, what is, however, is that I do not know length of the any index of array (meaning len(arr[i]) would be different for each index, the only way how I can be sure that I am accessing the "V" or "K" is by using split function)

arr[0].split(";")[1]

Is there a simple code that would replace the 6th elements (after split) in index to a new value?

What I am trying to achieve is to print

from

"5;V;K;4406632419324152;0123;172;9;0;0;06012020;3000"

to

"5;V;K;4406632419324152;0123;172;newValue;0;0;06012020;3000"

can't you read file as cvs file or something similar - ie. using pandas? — furas
– furas, Commented Jan 25, 2020 at 12:08
well it is unfortunately a highschool group project. We are only "allowed" or "adviced" to use pure tkinter. Even the file has to be a .txt — Sam333
– Sam333, Commented Jan 25, 2020 at 12:15

Nick · Accepted Answer · 2020-01-25 12:08:09Z

1

You can use a list comprehension with a ternary operator to replace the 6th element:

arr=["5;V;K;4406632419324152;0123;172;9;0;0;06012020;3000",
"2;M;K;4406553211445698;0123;124;2;0;0;06012020;2000",
"3;M;K;5412115956124218;0123;236;3;0;1;06012020;2000",
"4;V;K;4406621015140546;0123;131;9;0;0;06012020;3000"]
new_value = 4
arr[0] = ';'.join(v if i != 6 else str(new_value) for i, v in enumerate(arr[0].split(';')))
print(arr)

Output:

['5;V;K;4406632419324152;0123;172;4;0;0;06012020;3000', 
 '2;M;K;4406553211445698;0123;124;2;0;0;06012020;2000', 
 '3;M;K;5412115956124218;0123;236;3;0;1;06012020;2000', 
 '4;V;K;4406621015140546;0123;131;9;0;0;06012020;3000'
]

answered Jan 25, 2020 at 12:08

Nick

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Python replace an index of list separated by split function

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