Practice: Iteration

Which loop should be used when iterating through every character in a string?

• A for loop using input()

• A for loop over the string

• A while loop with a counter

• A nested while loop structure

Answer explanation

A for loop directly iterates over each character in a string without manual indexing. A while loop works but requires extra counter management that is unnecessary.

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Blooms Level: Apply

How many times does the inner statement run: for i in range(3): for j in range(4): print(i,j)?

• 16 times

• 12 times

• 7 times

• 9 times

Answer explanation

Nested loops multiply iterations: 3 outer times 4 inner equals 12. Adding the ranges instead of multiplying them is a common mix-up that produces 7.

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Blooms Level: Apply

In a number-guessing game using while True, which statement ends the loop after a correct guess?

• Continue

• Pass

• Break

• Return

Answer explanation

break exits the infinite loop immediately when the correct guess is made. continue only skips to the next iteration, leaving the loop running.

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Blooms Level: Apply

Which loop runs its body at least once even if the condition is initially false?

• Python for loop only

• Python while loop only

• Both for and while loops

• None of Python's built-in loops

Answer explanation

Python has no do-while construct; both while and for loops check the condition before the first iteration, so neither guarantees one execution.

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Blooms Level: Understand

Which TWO statements about the continue statement are true? (Select all that apply)

• It exits the loop entirely

• It restarts the loop from the first iteration

• It skips the remaining code in the current iteration

• It moves to the next iteration of the loop

• It raises a StopIteration exception

Answer explanation

continue jumps past the rest of the current iteration and proceeds to the next one. It does not exit or restart the loop.

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Blooms Level: Understand

Which while header keeps prompting until input is between 1 and 10 inclusive?

• While x < 1 and x > 10:

• While 1 < x < 10:

• While not x in range(10):

• While x < 1 or x > 10:

Answer explanation

The loop must continue while the value is outside the valid range, meaning below 1 OR above 10. Using and would require both conditions simultaneously, which is impossible.

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Blooms Level: Apply

What is the role of pass inside an empty else clause of a for loop?

• Exits the loop early

• Skips the current iteration

• Repeats the previous iteration

• Acts as a no-op placeholder

Answer explanation

pass satisfies Python's requirement for a non-empty block without performing any action. It does not affect loop control in any way.

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Blooms Level: Understand

Which TWO loops correctly print numbers 1 through 5? (Select all that apply)

• For i in range(5): print(i)

• For i in range(1,6): print(i)

• I=1; while i<=5: print(i); i+=1

• I=0; while i<5: print(i)

• For i in range(1,5): print(i)

Answer explanation

range(1,6) yields 1 through 5, and the while loop with i+=1 increments correctly through 5. Option A starts at 0 and option D has no increment, causing an infinite loop.

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Blooms Level: Analyze

Which condition continues a while loop only when both flags are True?

• While ready and active:

• While not ready and active:

• While ready == active:

• While ready or active:

Answer explanation

and requires both operands to be True. or would continue if just one were True.

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Blooms Level: Apply

Inside two nested for loops, what does a single break in the inner loop do?

• Skips the next outer iteration

• Restarts the inner loop

• Exits only the inner loop

• Exits both loops at once

Answer explanation

break only terminates the loop that directly contains it, so the outer loop continues with its next iteration. Exiting both loops requires additional logic.

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Blooms Level: Understand