def loads(self, requirements_text):
        lines = re.findall(Requirement.spec_regex,
                           requirements_text,
                           re.MULTILINE)
        for line in lines:
            self.add(Requirement(line[0], "".join(line[1:])))
def ignoring_sigint(cls):
        """A contextmanager which disables handling sigint in the current signal handler. This
        allows threads that are not the main thread to ignore sigint.

        NB: Only use this if you can't use ExceptionSink.trapped_signals().

        Class state:
        - Toggles `self._ignore_sigint` in `cls._signal_handler`.
        """
        with cls._signal_handler._ignoring_sigint():
            yield