Controlling loop execution Flashcards

What is the output of: ```python for i in range(4): if i % 2 == 0: continue print(i) ```

Answer: 1 3

`continue` skips even numbers, so only odd values 1 and 3 are printed.

Which scenario would cause a `while` loop's `else` block to NOT execute?

Answer: A `break` statement exits the loop

The `else` block is skipped only when a `break` statement terminates the loop early.

What does `pass` do when used inside a loop body?

Answer: Does nothing; acts as a placeholder

`pass` is a no-op statement used as a syntactic placeholder where a statement is required.

What is printed by this code? ```python for i in range(3): for j in range(3): if j == 1: break print(i, j) ```

Answer: 0 1 1 1 2 1

The inner loop breaks when j==1, so j is 1 at that point; the outer loop prints i and j for each i.

In Python, can `break` be used outside of a loop?

Answer: No, it causes a SyntaxError

Using `break` outside a loop results in a SyntaxError because it has no loop to break out of.

What is the output of: ```python i = 0 while i < 5: i += 1 if i == 3: continue if i == 4: break print(i) ```

Answer: 4

When i reaches 4, `break` fires before the print, then `print(i)` outside the loop prints 4.

Which statement correctly describes the behavior of `for i in range(0):`?

Answer: The loop body never executes

`range(0)` produces an empty sequence, so the loop body executes zero times.