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 closeCliConnectionTo(self):
        if self._connection == None:
            return
        self._exit_modes_beyond(-1)
        self.modeList = []
        self._debugLog("Exited all modes.")
        self.forceCloseCliConnectionTo()