[split] NameError: name 'csvwriter' is not defined. Did you mean: 'writer'?

[cathy12]

i am catherine. I just now started to learn python.

import random
import csv
a={"1":1}
print(len(a))

for i in range(100):
    x=random.randint(1, 100)
    a[i] = x
    print(a)
   
with open('random.csv', 'w', newline='') as csvfile:
    fields = ['QNO', 'RQNO']
    writer = csv.DictWriter(csvfile, fieldnames=fields)
    writer.writeheader()
for i in range(101):
    #j=a[i]
    #print(i,j)
    writer.writerow({'QNO':i , 'RQNO': a[i]})
file.close()    

i get err

Error:
File "e:\phy-prg\4.py", line 18, in <module>
    csvwriter.writerow({'QNO':i , 'RQNO': a[i]})
NameError: name 'csvwriter' is not defined. Did you mean: 'writer'?