data_manager.py

import connection


def delete():
    connection.delete_from('cards')
    connection.delete_from('boards')


def fill_boards(boards):
    for board in boards:
        connection.insert_to_boards(board)


def fill_cards(cards):
    for card in cards:
        connection.insert_to_cards(card)


def check_username(new_username):
    usernames = connection.get_all_usernames()
    for username in usernames:
        if username['nick_name'] == new_username:
            return 'existing'
    return 'not-existing'