Function change_cwd

Lib/test/support/os_helper.py:549–579

Return a context manager that changes the current working directory. Arguments: path: the directory to use as the temporary current working directory. quiet: if False (the default), the context manager raises an exception on error. Otherwise, it issues only a warning and

(path, quiet=False)

@contextlib.contextmanager
def change_cwd(path, quiet=False):
    """Return a context manager that changes the current working directory.

    Arguments:

      path: the directory to use as the temporary current working directory.

      quiet: if False (the default), the context manager raises an exception
        on error.  Otherwise, it issues only a warning and keeps the current
        working directory the same.

    """
    saved_dir = os.getcwd()
    try:
        os.chdir(os.path.realpath(path))
    except OSError as exc:
        if not quiet:
            raise
        logging.getLogger(__name__).warning(
            'tests may fail, unable to change the current working directory '
            'to %r: %s',
            path,
            exc,
            exc_info=exc,
            stack_info=True,
            stacklevel=3,
        )
    try:
        yield os.getcwd()
    finally:
        os.chdir(saved_dir)


@contextlib.contextmanager