Why do I not have to define the variable in a for loop using range(), but I do have to in a while loop in Python?

Question

I have the following code using a for loop:

    total = 0
    for num in range(101):
       total = total + num
       print(total)

Now the

Answer 1

If you are coming from other programming languages like C, C++ or Java then do not confuse with for in loop of python.

In python, for in loop pick one item from list of items and does something with help of the picked item.