question no. 2 and 3, separate sequence
question no. 2 and 3 solutions provide confusion to me, because u told two separate sequence , two variables can use. in this case three separate sequence, three variables only use but in your solution you are using only one variable, how it posiible.
Python-3.4.3 Loading-Data-From-Files 08-09 min 40-50 sec
The variable that is being used is single but it is a sequence of sequences or a list of lists. So the single variable contains all the three sequences.Please use print( variable_name ) to check the contents of the variable