Automatiser une création de compte sur un programme

toto:123456
lulu:roxor

USERS_FILE = 'users.txt'


def user_save(user_name, user_password):
    with open(USERS_FILE, 'a') as f:
        f.write('{}:{}\n'.format(user_name, user_password))


def users_load():
    users = []
    with open(USERS_FILE) as f:
        for line in f:
            users.append(line.rstrip().split(':'))
    return users


def user_exists(user_name):
    users = users_load()
    for name, _ in users:
        if name == user_name:
            return True
    return False


def user_connect(user_name, user_password):
    users = users_load()
    for name, password in users:
        if name == user_name:
            if password == user_password:
                return True
            break
    return False

print(user_connect('toto', '1234'))
print(user_connect('toto', '123456'))
print(user_exists('lulu'))
print(user_connect('lulu', 'roxor'))

name = 'loulou'
password = '42çarox'
if not user_exists(name):
    user_save(name, password)
    print(name, 'saved')
else:
    print('username', name, 'exists')

print(user_connect(name, '123456'))
print(user_connect(name, password))

u = input("Entrez ceci : '<pseudo>:<mdp>' : ")
            users_file.remove("{}".format(u))
            if u not in users_file:
                print("Suppression effectuée avec succès !")
            else:
                print("Echec de la supression.")

        	fic = open("105 12.46.13.txt", "r")
        	print("Liste des utilisateurs :")
        	content = fic.read()
        	print(content)
        	u=input("Quel utilisateur souhaitez vous supprimer (entrez son pseudonyme) : ")
        	fic.readlines()
        	if u in fic:
        		fic.writelines("")
        		print("Suppression efféctuée avec succès !")
        		fic.close()
        	else:
        		print("Echec de la suppression.")
        		fic.close()

user_to_del = ''
            user_to_del = input("Veuillez entrer un pseudonyme : ")
            with open('users.txt') as f:
            	users = f.readlines()
            	for user in users:
                    if not user.strip():
                        continue
            	    name, _ = user.split(':', 1)#ici
            	    if name == user_to_del:
                        users.remove(user)
                        print('user', user_to_del, 'deleted')
                        break
                    else:
                	raise ValueError('user {} not found'.format(user_to_del))
                    with open('users.txt', 'w') as f:
                        f.writelines(users)

            user_to_del = ""
            user_to_del = input("Veuillez entrer un pseudonyme : ")
            with open('users.txt') as f:
             users = f.readlines()
             for user in users:
                    if not user.strip():
                        continue
                 name, _ = user.split(':', 1)
                 if name == user_to_del:
                        users.remove(user)
                        print('user', user_to_del, 'deleted')
                        break
                else:
                    raise ValueError('user {} not found'.format(user_to_del))
            with open('users.txt', 'w') as f:
                f.writelines(users)