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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 create_atype(self, projects):
 """Create and return a new atype :param projects: the projects for the atype :type projects: :class:`jukeboxcore.djadapter.models.Project` :returns: The created atype or None :rtype: None | :class:`jukeboxcore.djadapter.models.Atype` :raises: None """

        dialog = AtypeCreatorDialog(projects=projects, parent=self)
        dialog.exec_()
        atype = dialog.atype
        return atype