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 setup_loader(request):
    setup_loader_modules = {pdbedit: {}}
    with pytest.helpers.loader_mock(request, setup_loader_modules) as loader_mock:
        yield loader_mock