# Buggy code
def py_interface(_dir, _make_venv):
    @contextlib.contextmanager
    def in_env(prefix, language_version):
        envdir = prefix.path(helpers.environment_dir(_dir, language_version))
        with envcontext(get_env_patch(envdir)):
            yield

    def healthy(prefix, language_version):
        with in_env(prefix, language_version):
            retcode, _, _ = cmd_output(
                "python",
                "-c",
                "import ctypes, datetime, io, os, ssl, weakref",
                retcode=None,
            )
        return retcode == 0

    def run_hook(hook, file_args):
        with in_env(hook.prefix, hook.language_version):
            return helpers.run_xargs(hook, helpers.to_cmd(hook), file_args)

    def install_environment(prefix, version, additional_dependencies):
        additional_dependencies = tuple(additional_dependencies)
        directory = helpers.environment_dir(_dir, version)

        env_dir = prefix.path(directory)
        with clean_path_on_failure(env_dir):
            if version != C.DEFAULT:
                python = norm_version(version)
            else:
                python = os.path.realpath(sys.executable)
            _make_venv(env_dir, python)
            with in_env(prefix, version):
                helpers.run_setup_cmd(
                    prefix,
                    ("pip", "install", ".") + additional_dependencies,
                )

    return in_env, healthy, run_hook, install_environment


# Traceback (UnicodeDecodeError)
An unexpected error has occurred: UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe3 in position 282: invalid continuation byte
Traceback (most recent call last):
File "c:\pytest\.tox\linting\lib\site-packages\pre_commit\error_handler.py", line 46, in error_handler
yield
File "c:\pytest\.tox\linting\lib\site-packages\pre_commit\main.py", line 294, in main
return run(args.config, store, args)
File "c:\pytest\.tox\linting\lib\site-packages\pre_commit\commands\run.py", line 285, in run
install_hook_envs(hooks, store)
File "c:\pytest\.tox\linting\lib\site-packages\pre_commit\repository.py", line 210, in install_hook_envs
if not _need_installed():
File "c:\pytest\.tox\linting\lib\site-packages\pre_commit\repository.py", line 205, in _need_installed
if hook.install_key not in seen and not hook.installed():
File "c:\pytest\.tox\linting\lib\site-packages\pre_commit\repository.py", line 75, in installed
lang.healthy(self.prefix, self.language_version)
File "c:\pytest\.tox\linting\lib\site-packages\pre_commit\languages\python.py", line 139, in healthy
retcode, _, _ = cmd_output(
File "c:\pytest\.tox\linting\lib\site-packages\pre_commit\util.py", line 149, in cmd_output
stderr = stderr.decode(encoding)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe3 in position 282: invalid continuation byte

# Fixed code
def py_interface(_dir, _make_venv):
    @contextlib.contextmanager
    def in_env(prefix, language_version):
        envdir = prefix.path(helpers.environment_dir(_dir, language_version))
        with envcontext(get_env_patch(envdir)):
            yield

    def healthy(prefix, language_version):
        with in_env(prefix, language_version):
            retcode, _, _ = cmd_output(
                "python",
                "-c",
                "import ctypes, datetime, io, os, ssl, weakref",
                retcode=None,
                encoding=None,
            )
        return retcode == 0

    def run_hook(hook, file_args):
        with in_env(hook.prefix, hook.language_version):
            return helpers.run_xargs(hook, helpers.to_cmd(hook), file_args)

    def install_environment(prefix, version, additional_dependencies):
        additional_dependencies = tuple(additional_dependencies)
        directory = helpers.environment_dir(_dir, version)

        env_dir = prefix.path(directory)
        with clean_path_on_failure(env_dir):
            if version != C.DEFAULT:
                python = norm_version(version)
            else:
                python = os.path.realpath(sys.executable)
            _make_venv(env_dir, python)
            with in_env(prefix, version):
                helpers.run_setup_cmd(
                    prefix,
                    ("pip", "install", ".") + additional_dependencies,
                )

    return in_env, healthy, run_hook, install_environment