Python For Loops Quiz

What is a for loop used for in Python?

• Iterating over a sequence

• Defining a function

• Creating a class

• Handling exceptions

Answer explanation

A for loop in Python is used for iterating over a sequence, making it the correct choice among the options provided.

Which of the following is NOT a sequence that a for loop can iterate over?

• Integer

• Dictionary

• Tuple

• List

Answer explanation

The correct choice is Integer because a for loop cannot directly iterate over a single integer value, it needs to be part of a sequence like a list, tuple, or dictionary.

What does the break statement do in a for loop?

• Skips the current iteration

• Continues with the next iteration

• Stops the loop before it has looped through all the items

• Restarts the loop

Answer explanation

Stops the loop before it has looped through all the items

What does the continue statement do in a for loop?

• Exits the loop

• Skips the current iteration and continues with the next

• Stops the loop

• Restarts the loop

Answer explanation

Skips the current iteration and continues with the next

What does the range() function do?

• Returns a sequence of numbers

• Returns a list of strings

• Returns a dictionary

• Returns a set of tuples

Answer explanation

The range() function returns a sequence of numbers, allowing you to generate a series of integers within a specified range.

What will be the output of the following code? for x in range(2, 6): print(x)

• 2 3 4 5 6

• 2 3 4 5

• 0 1 2 3 4 5

• 3 4 5 6

Answer explanation

The output will be 2 3 4 5 because the range function generates numbers from 2 to 5 (not including 6) and the loop prints each number in the range.

What is the purpose of the else block in a for loop?

• To execute a block of code if the loop is infinite

• To execute a block of code if the loop is skipped

• To execute a block of code before the loop starts

• To execute a block of code when the loop is finished

Answer explanation

To execute a block of code when the loop is finished

What will be the output of the following code? for x in range(6): if x == 3: break print(x) else: print('Finally finished!')

• 0 1 2 3

• 0 1 2

• 0 1 2 3 4 5 Finally finished!

• 0 1 2 Finally finished!

Answer explanation

The code will print numbers from 0 to 2, then the loop will break when x equals 3. The 'else' block will not be executed since the loop was terminated early.

What is a nested loop?

• A loop with a break statement

• A loop inside a loop

• A loop that runs infinitely

• A loop with a continue statement

Answer explanation

A nested loop is a loop inside another loop, allowing for repeated execution of the inner loop within each iteration of the outer loop.

What will be the output of the following code? for x in range(1, 10, 2): print(x)

• 1 2 3 4 5 6 7 8 9

• 1 3 5 7 9

• 2 4 6 8 10

• 1 2 3 4 5 6 7 8 9 10

Answer explanation

The code uses the range function with a step of 2, starting from 1 and ending before 10. So, it prints every second number in the range, resulting in 1 3 5 7 9 as the output.