    def _replace_in_file(self, dir_name, filename, args):
        path = os.path.join(dir_name, filename)
        with open(path, "r") as f:
            s = f.read()
        s = s.replace("{%PROJECT_ID%}", args.id)
        s = s.replace("{%PROJECT_ID_UPPER%}", self._upper_slug)
        s = s.replace("{%PROJECT_ID_LOWER%}", self._lower_slug)
        s = s.replace("{%PROJECT_NAME%}", args.name)
        s = s.replace("{%PROJECT_GITHUB_USER%}", args.github_user)

        with open(path, "w") as f:
            f.write(s)