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_name(self):
        """
        Find the most appropriate display name for a user: look for a "display_name", then
        a "real_name", and finally fall back to the always-present "name".
        """
        for k in self._NAME_KEYS:
            if self._raw.get(k):
                return self._raw[k]
            if "profile" in self._raw and self._raw["profile"].get(k):
                return self._raw["profile"][k]
        return self._raw["name"]