python updating single value in csv file

Question

I have this script, where I intend to update a value in a CSV

I understand that I will write it back to the file to actually effect the changes, but I was expecting to be able to change the value in the row list like below.

However, before and after the change, the row remains the same,

Why would that be?

with open(tasks) as csv_file:
    csv_reader = csv.reader(csv_file, delimiter=',')
    for row in csv_reader:
        row[1] == 'ddd'
        print(row)

What's the problem you are facing?

bigbounty
– bigbounty

2020-07-14 08:50:18 +00:00
Commented Jul 14, 2020 at 8:50 — bigbounty
– bigbounty, Commented Jul 14, 2020 at 8:50

Jan · Accepted Answer · 2020-07-14 08:54:54Z

1

You surely meant:

row[1] = 'ddd'
#     ^^^

Your former expression was a boolean test (==) not an assignment and you did nothing with it (no return value whatsoever).

answered Jul 14, 2020 at 8:54

Jan

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Comments

akio.tanaka · Accepted Answer · 2020-07-14 08:56:41Z

0

I think that you should do like below:

row[1] = 'ddd'

answered Jul 14, 2020 at 8:56

akio.tanaka

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