def df_column_to_strings(person_df, column_name):
    """
    Function is intended to take a particular column from a dataframe and convert
    the values in said column into a string that can be used for a query (e.g. only
    searching amongst a specific set of persons).
    
    Parameters
    ----------
    person_df (df): dataframe that contains a columnt that can be converted
        into a longer string for use in future queries
    
    column_name (str): name of the column to be converted into a longer string
    
    Returns
    -------
    column_string (str): the string that contains all of the values previously
        contained within the dataframe's columns
    """
    
    column_results = person_df[column_name].tolist()
    
    column_string = "("

    column_length = len(column_results)

    for idx, val in enumerate(column_results):
        column_string += str(val)

        if idx < column_length - 1:
            column_string += ", "
        else:
            column_string += ")"
            
    return column_string