How to use the pyscaffold.contrib.pbr.pbr.version.SemanticVersion function in PyScaffold

if self._patch:
            new_patch = self._patch - 1
            new_minor = self._minor
            new_major = self._major
        else:
            new_patch = 9999
            if self._minor:
                new_minor = self._minor - 1
                new_major = self._major
            else:
                new_minor = 9999
                if self._major:
                    new_major = self._major - 1
                else:
                    new_major = 0
        return SemanticVersion(
            new_major, new_minor, new_patch)

if minor:
            new_minor = self._minor + 1
            new_patch = 0
            new_prerelease_type = None
            new_prerelease = None
        else:
            new_minor = self._minor
        if major:
            new_major = self._major + 1
            new_minor = 0
            new_patch = 0
            new_prerelease_type = None
            new_prerelease = None
        else:
            new_major = self._major
        return SemanticVersion(
            new_major, new_minor, new_patch,
            new_prerelease_type, new_prerelease)

# Current RC/beta layout
                prerelease_type, prerelease = _parse_type(remainder[0])
                remainder = remainder[1:]
            while remainder:
                component = remainder[0]
                if component.startswith('dev'):
                    dev_count = int(component[3:])
                elif component.startswith('post'):
                    dev_count = None
                    post_count = int(component[4:])
                else:
                    raise ValueError(
                        'Unknown remainder %r in %r'
                        % (remainder, version_string))
                remainder = remainder[1:]
        result = SemanticVersion(
            major, minor, patch, prerelease_type=prerelease_type,
            prerelease=prerelease, dev_count=dev_count)
        if post_count:
            if dev_count:
                raise ValueError(
                    'Cannot combine postN and devN - no mapping in %r'
                    % (version_string,))
            result = result.increment().to_dev(post_count)
        return result

def to_dev(self, dev_count):
        """Return a development version of this semver.

        :param dev_count: The number of commits since the last release.
        """
        return SemanticVersion(
            self._major, self._minor, self._patch, self._prerelease_type,
            self._prerelease, dev_count=dev_count)