Python file editing bug help

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Python

Trying to write some code to read an edit a text file in python. but am getting some really weird bugs that do not make sense to me.

import fileinput
import linecache


def GetdataV1(Index,lineindex):#only works for Index3 and 2..every other index it will state "list index out of range"
    #Datafile = open("Trade data/Databaseforbot", "r")
    Linetoget = linecache.getline('Trade data/Databaseforbot', lineindex).split("|")
    Traddetail = Linetoget[Index].split("*")
    print(Traddetail[1])
    return Traddetail[1]






def PostdataV1(index,lineindex,data):#converts all to Hello instead of the specific part we wantot change to Hello
    # all 0's to "Hello"
    with fileinput.FileInput('Trade data/Databaseforbot', inplace=True, backup='.bak') as file:
        Datatoget = linecache.getline('Trade data/Databaseforbot', lineindex).split("|")
        finalvaluechange = Datatoget[index].split("*")
        #finalvaluechange = seperated.split("*")
        print(finalvaluechange[1])
        for line in file:
             print(line.replace(finalvaluechange[1], data), end='')



PostdataV1(3,1,"Hello")

What I have tried:

Some really weird bugs that do not make sense...as how can the index be out of list for 4 but not 3 or 2 when the .split forms 10 different parts

Also for the post if you do

PostdataV1(3,2)

it should return
this as the file

1|https://app.libertex.com/products/stock/BA/|3*34#34|4*0|5*0|6*0|7*0|8*0|9*0|CDwindow-76447D5BFE266B666CB3494980C5C4EB
2|https://app.libertex.com/products/stock/BA/|3*23#23|4*Hello|5*0|6*0|7*0|8*0|9*0|CDwindow-76447D5BFE266B666CB3494980C5C4EB

instead it edits the text file to look like this

1|https://app.libertex.com/products/stock/BA/|3*34#34|4*Hello|5*Hello|6*Hello|7*Hello|8*Hello|9*Hello|CDwindow-76447D5BFE266B666CB349498HelloC5C4EB
2|https://app.libertex.com/products/stock/BA/|3*23#23|4*Hello|5*Hello|6*Hello|7*Hello|8*Hello|9*Hello|CDwindow-76447D5BFE266B666CB349498HelloC5C4EB
where everywhere where there is a 0 there is"Hello"

Do you think its got anything to do with the fact im using * as the splitter?