def __repr__(self):
        return "<Requirement(package={package}, version='{version}')>".format(
            package=self.package, version=self.version)
def __init__(self, signum, signame):
            self.signum = signum
            self.signame = signame
            self.traceback_lines = traceback.format_stack()
            super(SignalHandler.SignalHandledNonLocalExit, self).__init__()