It checks if there is not a None inside the tuple (a1, a2) and return True if there is not and False if there is. Its just like (a1 != None and a2 != None)

Hi Keresh. There is. on python 2 int division returns int. On python 3 return float. So:

Python 2:

>>> 10 / 3
3

Python 3:

>>> 10 / 3
3.3333333333333335
>>> 10 // 3
3