def create_coin_dict(plat=0, gold=0, silver=0, copper=0):
    """
    Creates a new dictionary with all 4 coin types.
    Any coin type that doesn't have a value passed to this method defaults to 0.

    Keyword Arguments:
        plat (int): The value of platinum coin.
        gold (int): The value of gold coin.
        silver (int): The value of silver coin.
        copper (int): The value of copper coin.
    Returns:
        coin_dict (dict): A dictionary consisting of all 4 coin types. 
    """
    return {'plat': plat, 'gold': gold, 'silver': silver, 'copper': copper}