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 display(self, callingWindow, srcContext, mainItem):
        if srcContext not in ("marketItemGroup", "marketItemMisc") or self.mainFrame.getActiveFit() is None:
            return False

        if mainItem is None:
            return False

        for attr in ("emDamage", "thermalDamage", "explosiveDamage", "kineticDamage"):
            if mainItem.getAttribute(attr) is not None:
                return True

        return False