def coerce(cls, string):
        """Create a :class:`Requirement` object from a given package spec."""
        match = re.match(cls.spec_regex, string)
        if not match:
            raise InvalidRequirementSpecError("could not parse requirement")
        package = match.group(1)
        if all(match.group(2, 3)):
            version = "".join(match.group(2, 3))
        else:
            version = None
        return cls(package, version)
def approve(self, user_id=None, service=""):
        """
        Approve the verification attempt for user

        Valid attempt statuses when calling this method:
            `submitted`, `approved`, `denied`

        After method completes:
            status is set to `approved`
            expiry_date is set to one year from now
        """
        self.expiry_date = now() + timedelta(
            days=settings.VERIFY_STUDENT["DAYS_GOOD_FOR"]
        )
        super(SoftwareSecurePhotoVerification, self).approve(user_id, service)