email validator need help

#20 code challenge email validator leon heaney mbugua

#email=input("enter your email adress")
#
#if "@" not in email and "." not in email:
#    print("your email is not valid try again")
#    email=invalid
#    
#else:
#    ("your email is valid")
#    email=valid
#
#while email == invalid:
#
#this was my first attempt but the code wouldn't loop to the top of the code if you got the email invalid

invalid_input = True
def start() :
    print ("Hello and welcome to email international")
    email = input ("please enter your email adress")
    if "@" not in email == "1":
        #stuff
        print("your email doesn't contain an @. Please try again")
        invalid_input = False # Set to False because input was valid
    elif "." not in email == "2":
        #stuff
        print("your code does not contain a dot. please try again")
        invalid_input = False # Set to False because input was valid
    elif email == "3": # you still have this as "if"; I would recommend keeping it as elif
        #stuff
        invalid_input = False # Set to False because input was valid
    #elif "@." in email == "4":
        #stuff
        #print("

else:
        print ("Your code is valid welcome to email international")
        #break
while invalid_input : # this will loop until invalid_input is set to be True
    start()

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