Remove all packages missing from list

def remove_extra_packages(self, packages, dry_run=False):
        """ Remove all packages missing from list """

        removal_list = self.determine_extra_packages(packages)
        if not removal_list:
            print("No packages to be removed")
        else:
            if dry_run:
                print("The following packages would be removed:\n    %s\n" %
                      "\n    ".join(removal_list))
            else:
                print("Removing packages\n")
                args = [
                    "pip",
                    "uninstall",
                    "-y",
                ]
                args.extend(list(removal_list))
                subprocess.check_call(args)