def _stringify_header(self, options):

        bits = []
        lpad, rpad = self._get_padding_widths(options)
        if options["border"]:
            if options["hrules"] in (ALL, FRAME):
                bits.append(self._hrule)
                bits.append("\n")
            if options["vrules"] in (ALL, FRAME):
                bits.append(options["vertical_char"])
            else:
                bits.append(" ")
        # For tables with no data or field names
        if not self._field_names:
            if options["vrules"] in (ALL, FRAME):
                bits.append(options["vertical_char"])
            else:
                bits.append(" ")
        for field, width, in zip(self._field_names, self._widths):
            if options["fields"] and field not in options["fields"]:
                continue
            if self._header_style == "cap":
                fieldname = field.capitalize()
            elif self._header_style == "title":
                fieldname = field.title()
            elif self._header_style == "upper":
                fieldname = field.upper()
            elif self._header_style == "lower":
                fieldname = field.lower()
            else:
                fieldname = field
            bits.append(" " * lpad + self._justify(fieldname, width, self._align[field]) + " " * rpad)
            if options["border"]:
                if options["vrules"] == ALL:
                    bits.append(options["vertical_char"])
                else:
                    bits.append(" ")
        # If vrules is FRAME, then we just appended a space at the end
        # of the last field, when we really want a vertical character
        if options["border"] and options["vrules"] == FRAME:
            bits.pop()
            bits.append(options["vertical_char"])
        if options["border"] and options["hrules"] != NONE:
            bits.append("\n")
            bits.append(self._hrule)
        return "".join(bits)
dataset/ETHPy150Open kxxoling/PTable/prettytable/prettytable.py/PrettyTable._stringify_header/original