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

With the csv module you can iterate over the rows and access each one as a dict. As also noted here, the preferred way to update a file is by using temporary file.

from tempfile import NamedTemporaryFile
import shutil
import csv

filename = 'my.csv'
tempfile = NamedTemporaryFile(mode='w', delete=False)

fields = ['ID', 'Name', 'Course', 'Year']

with open(filename, 'r') as csvfile, tempfile:
    reader = csv.DictReader(csvfile, fieldnames=fields)
    writer = csv.DictWriter(tempfile, fieldnames=fields)
    for row in reader:
        if row['ID'] == str(stud_ID):
            print('updating row', row['ID'])
            row['Name'], row['Course'], row['Year'] = stud_name, stud_course, stud_year
        row = {'ID': row['ID'], 'Name': row['Name'], 'Course': row['Course'], 'Year': row['Year']}
        writer.writerow(row)

shutil.move(tempfile.name, filename)

If that's still not working you might try one of these encodings:

with open(filename, 'r', encoding='utf8') as csvfile, tempfile:
with open(filename, 'r', encoding='ascii') as csvfile, tempfile:

Edit: added str, print and encodings