Controlling loop execution Flashcards

What is the output of: ```python for i in range(3): for j in range(3): if i == j: continue print(i, j) ```

Answer: Prints all pairs where i != j

`continue` skips printing when i equals j, so only pairs where i != j are printed.

What is the final value of `total` after this code? ```python total = 0 for i in range(1, 10): if i % 2 == 0: continue total += i print(total) ```

Answer: 25

Only odd numbers 1,3,5,7,9 are summed (evens are skipped), totaling 25.

What happens to the loop variable after a `for` loop completes normally in Python?

Answer: It retains the last value assigned during iteration

In Python, the loop variable persists in the local scope with its last assigned value after the loop ends.

What is printed by: ```python x = 5 while x > 0: x -= 1 if x == 2: continue print(x) ```

Answer: 4 3 1 0

When x becomes 2, `continue` skips the print, so 4, 3, 1, and 0 are printed.

Which of the following is a valid reason to use a `while True:` loop with `break`?

Answer: When the exit condition is complex and easier to check mid-body

`while True:` with `break` is useful when the termination condition is best evaluated in the middle of the loop body.

What does this code output? ```python for i in range(1, 4): print(i) else: print('end') ```

Answer: 1 2 3 end

The loop prints 1, 2, 3 and since no `break` occurs, the `else` clause prints 'end'.

What is the output of: ```python for i in range(5): if i == 3: break else: print('no break') print('after') ```

Answer: after

The `break` at i==3 prevents the `else` from running, but `print('after')` outside the loop executes.