Doc for using raw container in the map task

[pingsutw]

• When using rawContainer in the map task, Input will become string representation of a list, so we have to convert it to a list.
• Users also need to get the array index first to process specific element in the list.

[wild-endeavor]

what is eval(a)? is this a [] literal? could we get an example of it? is there any other way of getting the list object like loading it through json.loads or something?

[cosmicBboy]

yeah maybe we don't use eval in our examples... or at least json.loads

[cosmicBboy]

Suggested change

	# Use Raw Container in the map task
	# Use Raw Container in map tasks

[cosmicBboy]

Suggested change

	# To use raw container in the map task, users have to
	# 1. Manually parse the input data. The input is string representation of a list, so we need to convert it to python list.
	# 2. Get array index (BATCH_JOB_ARRAY_INDEX_VAR_NAME), and use it to get the element in the list.
	# To use raw container in the map task, users have to:
	#
	# 1. Manually parse the input data. The input is string representation of a list, so we need to convert it to python list.
	# 2. Get array index ``(BATCH_JOB_ARRAY_INDEX_VAR_NAME)``, and use it to get the element in the list.

[cosmicBboy]

yeah maybe we don't use eval in our examples... or at least json.loads