def entry_string(key, value, entry_char=">", attribution_char="=",
                 end_char="\n"):
    """Converts a keyword and a value to an accepted input string for
    'read_config_file.

    Inputs
    ----------
    key : str
        Keyword (name of the option/parameter). If not string, a
        conversion is attempted.
    value : str
        Value of the option/parameter. If not a string, a conversion
        is attempted.
    entry_char : str
        Character to start the line.
    attribution_char : str
        Character that separates the key from the value.
    end_char : str
        Character inserted at the end of the string.

    Returns
    ----------
    result_str : str
        String with an input line containing '> key = value'.
    """
    result_str = entry_char + " "
    result_str += str(key)
    result_str += " " + attribution_char + " "
    result_str += str(value)
    result_str += end_char
    return result_str