how accept lowercase and uppercase for string data input in python?

ask user to enter registration type
Hi I tried to make the if condition accept the answer when the user enters it in lowercase or uppercase

reg = input("\nRegistration type (single or family): ") 

>Solution :

reg = input("\nRegistration type (single or family): ") 

if reg in ['single', 'family', 'SINGLE', 'FAMILY']:
    if reg.isupper():
        print("accepted in uppercase")
    elif reg.islower():
        print("accepted in lowercase")
else:
    print("not accepted")

working code