loop through list or double loop

[3Pinter]

Yeah I figured, typing without example is bs, sorry for that. Let me try again.

#inputlist comes from another program which could either be a single list like inputlist_a or like inputlist_b BUT could also be a presented with nested lists like inputlist_c
inputlist_a = ["sheet1", "sheet2", "sheet3"]
inputlist_b = ["sheet124", "sheet1233", "sheet12373"]
inputlist_c = [a, b]

#since I don't know the input I'm going to name this INPUT


if isinstance(INPUT, list):
	for i in INPUT:
		if isinstance(i, list)
			for j in i:
				domyfunction(j) 
		else
			domyfunction(i)

#so in case of inputlist_a:
#domyfunction loops sheet1, sheet2, sheet3
#so in case of inputlist_b:
#domyfunction loops sheet124, sheet1233, sheet12373
#so in case of inputlist_c:
#domyfunction loops sheet1, sheet2, sheet3 THEN sheet124, sheet1233, sheet12373