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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def from_veto_def(cls, veto):
 """Define a `DataQualityFlag` from a `VetoDef` Parameters veto : :class:`~ligo.lw.lsctables.VetoDef` veto definition to convert from """

        name = '%s:%s' % (veto.ifo, veto.name)
        try:
            name += ':%d' % int(veto.version)
        except TypeError:
            pass
        if veto.end_time == 0:
            veto.end_time = +inf
        known = Segment(veto.start_time, veto.end_time)
        pad = (veto.start_pad, veto.end_pad)
        return cls(name=name, known=[known], category=veto.category,
                   description=veto.comment, padding=pad)