I love your Question!

Okay so my solution is a list comphrehension and i discuss this in other article that list comphrehension is faster of indexing and loop rather then usual loops and indexing.

Here is itertool code

def from_iterable(iterables):

# chain.from_iterable(['ABC', 'DEF']) --> A B C D E F

for it in iterables:

for element in it:

yield element

So in my views List comphrehension always a faster approach for indexing.

Thank you

Please feel free to ask any other question