def __init__(self, package, version):
        """Construct a new requirement.

        :param package: the package name.
        :param version: a semver compatible version specification.
        """
        self.package = package
        self.version = version
        if self.version and not re.match(r"[<=>~]", version[:2]):
            self.version = "=={}".format(self.version)
def on_fuzz_msg_changed(self, index: int):
        self.ui.comboBoxFuzzingLabel.setDisabled(False)

        sel_label_ind = self.ui.comboBoxFuzzingLabel.currentIndex()
        self.ui.comboBoxFuzzingLabel.blockSignals(True)
        self.ui.comboBoxFuzzingLabel.clear()

        if len(self.message.message_type) == 0:
            self.ui.comboBoxFuzzingLabel.setDisabled(True)
            return

        self.ui.comboBoxFuzzingLabel.addItems([lbl.name for lbl in self.message.message_type])
        self.ui.comboBoxFuzzingLabel.blockSignals(False)

        if sel_label_ind < self.ui.comboBoxFuzzingLabel.count():
            self.ui.comboBoxFuzzingLabel.setCurrentIndex(sel_label_ind)
        else:
            self.ui.comboBoxFuzzingLabel.setCurrentIndex(0)

        self.fuzz_table_model.fuzzing_label = self.current_label
        self.fuzz_table_model.update()
        self.update_message_data_string()