How to update rows in a CSV file

Question

Hello I\'m trying to make a program that updates the values in a csv. The user searches for the ID, and if the ID exists, it gets the new values you want to replace on the r

Answer 1

Simply write to a new file at same time reading over the lines of original, conditionally changing the row based on Stud_ID value. New file is suffixed _new in name.

line_replace = stud_ID +','+ stud_name +','+ stud_course +','+ stud_year

with open(fileName, 'r') as readFile, open(fileName.replace('.csv', '_new.csv'), 'w') as writeFile: 
   for row in readFile:
      if row[0:9] == stud_ID:
         writeFile.write(line_replace)
         msg = Label(upd_win, text="Updated Successful", font="fixedsys 12 bold").place(x=3,y=120)
      else: 
         writeFile.write(row)