def ordered_dict_values(dictionary):
    """
    A function to obtain unique values from a dictionary
    
    Parameters
    ----------
    dictionary: dict
        Dictionary to obtain unique values from 
    
    Returns
    -------
    lst: list
        A list of unique values in the dictionary by order of appearance
    """
    lst = []
    for v in dictionary.values():
        if v not in lst:
            lst.append(v)
    return lst