is a collection of information stored under a single name.

def missing_num(lst):
for n in range(1,11):
if n not in lst:
print(n)
lst = (1,3,4,5,6,7,8,9,10)
missing_num(lst)
I hope this helps!
Transistors , as in the past vacuum tubes were used which took much larger space.
Now with transistor you can create very complicated logical circuits in very limited space.