def open_file(file, mode):
	"""Open a file.

	:arg file: file-like or path-like object.
	:arg str mode: ``mode`` argument for :func:`open`.
	"""
	if hasattr(file, "read"):
		return file
	if hasattr(file, "open"):
		return file.open(mode)
	return open(file, mode)
Open a file.

	:arg file: file-like or path-like object.
	:arg str mode: ``mode`` argument for :func:`open`.