Its showing me error when i try to use csv.writer() in python claiming that the writer function does not exist in csv module what should i do

Question

Here is my code:

import csv
def addr():
    with open('csvfile.csv','a',newline='') as f:
        w=csv.writer(f,delimiter=',')
        tid=int(input('Teacher ID: '))
        nm=input('Enter Name: ')
        mo=int(input('Mobile Number: '))
        w.writerow(tid,nm,mo)
def countr():
    with open('csvfile.csv') as f:
        c=csv.rowcount
        print('Number of records:',c)
while True:
    addr()
    if input('Do you Wish to Continue? (Y/N): ').lower() in ('n','no'):
        break

enter image description here

It showed no error when I tried to use the normal file.write()