@property<EOL><INDENT>def fastq(self):<DEDENT>
if self.qual is None:<EOL><INDENT>self._fastq = None<EOL><DEDENT>else:<EOL><INDENT>if self._fastq is None:<EOL><INDENT>self._fastq = '<STR_LIT>'.format(self.id, self.sequence, self.qual)<EOL><DEDENT><DEDENT>return self._fastq<EOL>
str: Returns the sequence, as a FASTQ-formatted string

If ``Sequence.qual`` is ``None``, then ``None`` will be returned instead of a
FASTQ string