How do I replace the value of pin in csv (Using DictWriter)

Question

I have this data and I want to replace the value of the pin with the given input using DictWriter

name,place,pin
john,usa,1234
corey,canada,1232
tom,usa,4534

def get_input(name,pin,place):
    with open("data.csv",'a') as file:
        data = csv.DictWriter(file,fieldnames=["name","place","pin"])
        data.writerow({"name":name,"pin":pin,"place":place})

How I'm suppose to replace any value in this csv file

Answer 1

Here is an example how to read the data.csv , change one pin value and save the data using csv.DictReader / csv.DictWriter :

import csv

# read the data as list of dicts
with open("data.csv", "r") as f_in:
    reader = csv.DictReader(f_in)
    data = list(reader)

# replace pin '1232' with '9999'
for row in data:
    if row["pin"] == "1232":
        row["pin"] = "9999"

# save the data
with open("output.csv", "w") as f_out:
    writer = csv.DictWriter(f_out, fieldnames=data[0].keys())
    writer.writeheader()
    writer.writerows(data)

The output.csv becomes:

name,place,pin
john,usa,1234
corey,canada,9999
tom,usa,4534