My Python login code

import csv
import random
new_setup_username = 0
setup_account = 0
login_1_success = 0


while setup_account == 0:
    returning_user = input("returning User? || YES / NO || ")
    #covering all yes bases VV
    if returning_user == ("YES"):
        setup_account = 1 #stage one = has account
    if returning_user == ("Yes"):
        setup_account = 1
    if returning_user == ("yes"):
        setup_account = 1
    if returning_user == ("Y"):
        setup_account = 1
    if returning_user == ("ye"):
        setup_account = 1
    if returning_user == ("y"):
        setup_account = 1
    if returning_user == ("Ye"):
        setup_account = 1
    if returning_user == ("YE"):
        setup_account = 1
    if len(returning_user) == 0:
        setup_account = 0
    #Covering all no bases VV
    if returning_user == ("NO"):
        setup_account = 2 #stage one = has account
    if returning_user == ("No"):
        setup_account = 2
    if returning_user == ("no"):
        setup_account = 2
    if returning_user == ("N"):
        setup_account = 2
    if returning_user == ("na"):
        setup_account = 2
    if returning_user == ("n"):
        setup_account = 2
    if returning_user == ("Na"):
        setup_account = 2
    if returning_user == ("NA"):
        setup_account = 2
while int(setup_account) == 2:
    print (" ")
    while new_setup_username == 0:

        new_username = input("Enter new username :: ")
        if len(new_username) == 0:

            print ("\n|| ERROR 422 || " + "Please Enter Something as a username")
            print(" ")
        elif len(new_username) < 8:

            print ("\nPlease enter a username with more than eight characters")
            print(" ")
        else:
            break
    while new_setup_username == 0:
        new_password = input("Enter new password :: ")
        if len(new_password) == 0:
            print("\n|| ERROR 422 || " + "Please Enter Something as a password")
            print( " ")
        if len(new_password) > 0:
            break
    new_password1 = input("  Confirm password :: ")

    if new_password == new_password1:
        if len(new_password) < 8:
            print ("Your password is very weak Please try again")
        if len(new_password) == 8:
            try_password_again = input ("Your Password is moderate do you want to try again? || YES / NO || ")
            if try_password_again == ("YES"):
                RANDOMUSELESSNESS = 0
            if try_password_again == ("NO"):
                print ("Your Password and username have been saved")
                setup_account = 1 # stage three = created account
        if len(new_password) > 8:
            setup_account = 1     #stage three = created account
            import csv


            row = [str(new_username), str(new_password)]

            with open('passwords.csv', 'a') as csvFile:
                writer = csv.writer(csvFile)
                writer.writerow(row)



        if not new_password == new_password1:
            print(" ")
            print("Your passwords do not match")
            print("Retrying")

login_1_success = 0
login_username_entered = 0
login_password_entered = 0
get_password = ""
while login_1_success == 0:
    with open("passwords.csv") as csvfile:
        reader = csv.reader(csvfile)
        while login_username_entered == 0:
            login_1_username = input("\nEnter username: ")
            if len(login_1_username) == 0:
                print("\nPlease enter a username")
            if len(login_1_username) > 0:
                login_username_entered = 1
        for row in reader:
            if row[0] == login_1_username:
                get_password = row[1]
        while login_password_entered == 0:

            login_1_password = input("\nEnter password: ")
            if len(login_1_password) == 0:
                print("\nPlease enter a password")
            if len(login_1_password) > 0:
                login_password_entered = 1

        if str(login_1_password) == str(get_password):
            login_1_success = 1
            csvfile.close()
        else:
            print("\nUsername/password is incorrect. Try Again.")
            login_1_success = 0
            csvfile.close()
print("\n Succesfully logged in")

csvfile.close()