Unable to Validate csv blanck data and write in csv

[prashant18]

Hi Support,
I have one csv file and some field is blank. now i m writing code to read csv file and if filed is blank then take the input from the user and write in csv.

CSV Format:

Output:
AccountId	RegionName	SubnetID	OS_Name	KeyName
	eastus	demo_subnet	server2012	window_keyname

import csv
reader = csv.DictReader(open("D:\python_Step_Step_Lab\Book1.csv"))
for raw in reader:
    print(raw)
    test=(raw['AccountId'])
    test01=(raw['RegionName'])
    test02=(raw['SubnetID'])
    test03=(raw['OS_Name'])
    test04=(raw['KeyName'])
   
    if test == '':
        print("Enter the AccountId: " ) # Required input from user and store in csv

    elif test01='':
        print("Enter the RegionName: ") # Required input from user and store in csv

    elif test02='':
        print("Enter the Subnet ID: ") # Required input from user and store in csv

    elif test03='':
        print("Enter the OS_Name: ") # Required input from user and store in csv

    elif test04='':
        print("Enter the KeyName: ") # Required input from user and store in csv
   
    else:
        print("All parameter is Correct")

            with open("D:\python_Step_Step_Lab\Book1.csv", 'w') as csvfile:      # Store the input in same file Book1.csv