Export the specified context to be capable context transferring

		:param context: context to export
		:return: tuple

def export_context(cls, context):
		""" Export the specified context to be capable context transferring

		:param context: context to export
		:return: tuple
		"""
		if context is None:
			return
		result = [(x.context_name(), x.context_value()) for x in context]
		result.reverse()
		return tuple(result)