How do For Loops work?

For loops will execute certain statements within the loop for a specified number of runs. This is an example of a python programme:1 for i in range(5): 2  print(i) 3 else: 4  print('done') In this example, the output is: 0, 1, 2, 3, 4, done. We specified we want the loop to run whilst it is in the range 0 < i < 4 on the first line. It only goes up to 4 as it starts at 0 (in python, counters start at 0 but you can make them start at 1 by assigning 1 to the counter before the loop e.g. i = 1). For loops update the counter automatically, which means that 1 is added to i after every run without having to write i += 1 after line 2. Therefore we get 0, 1, 2, 3, 4 as outputs for the first 5 runs, but as i becomes i = 6 after the 5th run, it is no longer in the range and does not satisfy the condition of the loop, therefore it moves to the else condition. Here, it executes line 4 and we get the output 'done'.