data/data_api.py
def is_registered(chat_id):
    """
    Checks whether a chat_id is already in the database.
    :param chat_id: The chat_id to check.
    :return: True if the user is registered, else False.
    """
    return str(chat_id) in dt.users

    Checks whether a chat_id is already in the database.
    :param chat_id: The chat_id to check.
    :return: True if the user is registered, else False.
    
Checks whether a chat_id is already in the database.
Checks whether a chat_id is already in the database .
def is_registered(chat_id):
    return str(chat_id) in dt.users
def is_registered ( chat_id ) : return str ( chat_id ) in dt . users
Checks whether a chat_id is already in the database.
Checks whether a chat_id is already in the database .
"""
    Checks whether a chat_id is already in the database.
    :param chat_id: The chat_id to check.
    :return: True if the user is registered, else False.
    """
True if the user is registered, else False.
True if the user is registered else False .
chat_id
The chat_id to check.
The chat_id to check .