def remove(self, elem):
        """Remove a requirement.

        :param elem: a string or :class:`Requirement` instance.
        """
        if isinstance(elem, text_type):
            for requirement in self:
                if requirement.package == elem:
                    return super(Requirements, self).remove(requirement)
        return super(Requirements, self).remove(elem)
def ajouter(self):
        """Méthode appelée lors de l'ajout de la commande à l'interpréteur"""
        cle = self.noeud.get_masque("cle")
        cle.proprietes["regex"] = r"'[a-z0-9_:]{3,}'"