Lesson 016
Control Flow: Loops
for · while · nested
1:00How for and while loops automate repetition — including iteration counting, the half-open range, break/continue, nested loops, and the classic off-by-one and infinite-loop pitfalls.
By the end, you can
- Explain the difference between definite and indefinite iteration.
- Trace a `for` loop over `range(n)`, listing every value the loop variable takes and the exact iteration count.
- Identify the off-by-one mistake in a `range` call and correct it.
- Trace a `while` loop step by step, and explain why a missing increment causes an infinite loop.
- Describe what `break` and `continue` each do, and distinguish their effects.
- Calculate the total iteration count of a nested loop (outer × inner).
- Choose between `for` and `while` given a problem description.
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