Python UsedDB Update

как реализовать метод update?

        from tabulate import tabulate
    from random import randint
    
    
    def FileManager(db_path):
        """
        :param db_path: string
        :return:
        """
        def parse_data(text=''):
            rows = text.split('\n')
            result = []
            for row in rows:
                result.append(row.split(';'))
            return result
    
        def write(data):
            try:
                with open(db_path,'a') as f:
                    f.write(data)
                    f.write("\n")
            except FileNotFoundError:
                print(f"File is not found {db_path}")
    
            return f"Write: {str(data)}"
    
        def read():
            try:
                file = open(db_path)
                data = file.read()
                file.close()
                return parse_data(data)
            except Exception as e:
                print(e)
    
        def update(id):
            # get id: integer or string
            # retrieve from file all data
            # use parsed_data to serialize
            # iterate for parsed list and compare two id's
            # [email, id, first_name, last_name] -> row[2] == value1 && row[3] == value2
            # serialize from list of lists to simple string
            # mode='w'
            return "Update"
    
        def delete():
            return "Delete"
    
        return {
            'write': write,
            'read': read,
            'update': update,
            'delete': delete
        }
    # ORM - own system
    def UserDB(fm = FileManager("email.csv")):
        """
        :param fm: {
            'write': function,
            'read': function,
            'update': function,
            'delete': function
        }
        :return:
        """
        required_fields = ['login_email', 'first_name', 'last_name']
        def add(*data, **kwargs):
            # if all fields are exist (validation process)
            # open file stream for writing
            #
            try:
                # validation step start
                counter = 0
                for x in kwargs:
                    if kwargs[x] == "":
                        raise Exception(f"{x} is required! Please enter an value!")
                    if x in required_fields:
                        counter += 1
                if counter != 3:
                    raise Exception(f"You must include all required fields: {','.join(required_fields)}\n")
                # validation step end
                user_entity = ''
                kwargs['identifier'] = randint(1_000, 1_0000)
                payload = {
                    0: kwargs['login_email'],
                    1: kwargs['identifier'],
                    2: kwargs['first_name'],
                    3: kwargs['last_name']
                }
                for field in payload:
                    user_entity += str(payload[field]) + ";"
                fm['write'](user_entity)
                return "You successfully added new user to database..."
            except Exception as e:
                print(e)
    
        def update(*args, **kwargs):
    
            return f"{fm['update']()}: Update user"
    
        def get_all(*data, **kwargs):
            return fm['read']()
    
        def get_by_id(id):
            rows = fm['read']()
            result = []
            for row in rows[1:]:
                if int(row[1]) == int(id):
                    result.append(row)
                    break
            result.insert(0, rows[0])
            return result
    
        def remove_by_id(id):
            rows = fm['read']()[1:-1]
    
            def filter_cb(row):
                return int(row[1]) != int(id)
    
            updated_list = list(filter(filter_cb, rows))
    
            result = ''
            for row in updated_list:
                result += ";".join(row)
    
            print('res', result.strip())
    
    
        return {
            'add': add,
            'update': update,
            'get_all': get_all,
            'remove_by_id': remove_by_id,
            'get_by_id': get_by_id
        }
    
    
    def render_table(data):
        print(tabulate(data[1:], headers=data[0]))
    
    
    db = UserDB()
    # Get user by id or get all users from database
    # render_table(db['get_all']())
    #
    # render_table(db['get_by_id'](2070))
    #
    # render_table(db['get_by_id'](9346))
    
    # Add user
    # db['add'](login_email = "[email protected]", first_name="John", last_name="Bradshaw")
    # render_table(db['get_all']())
    
    # db['remove_by_id'](4081)