Why does this not create an infinite loop?

a=5
for i in range(1,a):print(i)a=a+1

or this

for i in range(1,4):print(i)i=i-1

or this

for i in range(1,4):print(i)i=1

Is there any way we can create infinite loops using a for loop? I know there is the while loop for that but I was just curious.

range is a class, and using in like e.g. range(1, a) creates an object of that class. This object is created only once, it is not recreated every iteration of the loop. That's the reason the first example will not result in an infinite loop.

The other two loops are not infinite because, unlike the range object, the loop variable i is recreated (or rather reinitialized) each iteration. The values you assign to i inside the loop will be overwritten as the loop iterates.