Write out a Python dictionary made of up string keys, and values
        that are strings, signed integers, Decimal, datetime.datetime, or
        sub-dictionaries following the same constraints.

def write_table(self, d):
        """
        Write out a Python dictionary made of up string keys, and values
        that are strings, signed integers, Decimal, datetime.datetime, or
        sub-dictionaries following the same constraints.

        """
        self._flushbits()
        table_data = AMQPWriter()
        for k, v in d.items():
            table_data.write_shortstr(k)
            if isinstance(v, basestring):
                if isinstance(v, unicode):
                    v = v.encode('utf-8')
                table_data.write(byte(83)) # 'S'
                table_data.write_longstr(v)
            elif isinstance(v, (int, long)):
                table_data.write(byte(73)) # 'I'
                table_data.write(pack('>i', v))
            elif isinstance(v, Decimal):
                table_data.write(byte(68)) # 'D'
                sign, digits, exponent = v.as_tuple()
                v = 0
                for d in digits:
                    v = (v * 10) + d
                if sign:
                    v = -v
                table_data.write_octet(-exponent)
                table_data.write(pack('>i', v))
            elif isinstance(v, datetime):
                table_data.write(byte(84)) # 'T'
                table_data.write_timestamp(v)
                ## FIXME: timezone ?
            elif isinstance(v, dict):
                table_data.write(byte(70)) # 'F'
                table_data.write_table(v)
            else:
                raise ValueError('%s not serializable in AMQP' % repr(v))
        table_data = table_data.getvalue()
        self.write_long(len(table_data))
        self.out.write(table_data)