ı am a new begıner .
why and when do we have to use "None"
for example if x. is None:
or at the definatıons
def lookfor(a, b=None): return a, b
why and where are we usıng None.whats the aım to use that
and my other questıon ıs when do we need to make list of lists
thanks alot for your answers
have a nıce year and day:)