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Python For Loop MCQs (25) — Answers at the End

Python For Loop MCQs (25)

Covers range(), iteration, break/continue, for–else, nested loops, and iteration over strings/dicts. Answers at the end

1) What is the output?

for i in range(3):
    print(i, end=" ")
A. 0 1 2
B. 1 2 3
C. 0 1 2 3
D. 1 2

2) Output?

for ch in "py":
    print(ch)
A. py
B. p⏎y
C. y⏎p
D. Error

3) What prints?

sum_ = 0
for n in range(1, 5):
    sum_ += n
print(sum_)
A. 10
B. 15
C. 5
D. 9

4) Choose the output.

for i in range(2, 8, 3):
    print(i, end="-")
A. 2-5-8-
B. 2-5-
C. 2-5-7-
D. 2-5-8-11-

5) What is printed?

for i in range(3, 0, -1):
    print(i, end="")
A. 321
B. 012
C. 123
D. 32

6) Output?

count = 0
for _ in range(5):
    if _ % 2 == 0:
        count += 1
print(count)
A. 2
B. 3
C. 4
D. 5

7) What prints?

for i in range(4):
    if i == 2:
        break
    print(i, end=" ")
A. 0 1
B. 0 1 2
C. 2 3
D. 0 1 2 3

8) Choose the output.

for i in range(4):
    if i == 2:
        continue
    print(i, end=" ")
A. 0 1 3
B. 0 2 3
C. 1 2 3
D. 0 1 2

9) Output?

for i in range(3):
    pass
print(i)
A. 0
B. 1
C. 2
D. NameError

10) What is printed?

nums = [1, 2, 3]
for x in nums:
    x = x * 10
print(nums)
A. [10, 20, 30]
B. [1, 2, 3]
C. [1, 20, 3]
D. Error

11) Choose the output.

for i in range(2):
    for j in range(2):
        print(i + j, end=" ")
A. 0 1 1 2
B. 0 1 2 3
C. 0 1 0 1
D. 1 2 1 2

12) Output?

for i in range(3):
    print("A")
else:
    print("B")
A. A A A
B. A A A B
C. B only
D. Error

13) for–else behavior?

for i in range(3):
    if i == 1:
        break
else:
    print("Done")
A. Prints “Done”
B. Prints nothing
C. Error
D. Prints i values then “Done”

14) What prints?

d = {"a": 1, "b": 2}
s = 0
for k in d:
    s += d[k]
print(s)
A. 0
B. ab
C. 3
D. Error

15) Choose the output.

for i in range(0):
    print("X")
else:
    print("Y")
A. X Y
B. Y
C. (no output)
D. X

16) Output?

vals = [0, 2, 0, 3]
for v in vals:
    if not v:
        continue
    print(v, end=" ")
A. 0 2 0 3
B. 2 3
C. 2 0 3
D. (no output)

17) What is printed?

x = range(1, 6, 2)
print(list(x))
A. [1, 3, 5]
B. [1, 2, 3, 4, 5]
C. [1, 3]
D. [3, 5]

18) Choose the output.

out = ""
for i in range(3):
    out += str(i)
print(out)
A. 012
B. 123
C. 01
D. 23

19) Output?

for i in range(1, 4):
    for j in range(i):
        pass
print(j)
Note: value of j after the loops.
A. 0
B. 1
C. 2
D. NameError

20) What prints?

items = {"x": 1, "y": 2}.items()
for k, v in items:
    print(k, v, end="; ")
A. x 1; y 2;
B. 1 x; 2 y;
C. (‘x’,1); (‘y’,2);
D. Error

21) Choose the output.

for i in range(5, 5):
    print("A")
print("B")
A. A B
B. B
C. (no output)
D. A A A A A B

22) What is printed?

for i in range(-1, -5, -2):
    print(i, end=" ")
A. -1 -2 -3 -4
B. -1 -3
C. -2 -4
D. (no output)

23) Output?

txt = "abba"
count = 0
for i in range(len(txt)-1):
    if txt[i] == txt[i+1]:
        count += 1
print(count)
A. 0
B. 1
C. 2
D. 3

24) Choose the output.

for i in range(3):
    for j in range(3):
        if i == j:
            break
        print(f"{i}{j}", end=" ")
A. 10 20 21
B. 01 02 10 12 20 21
C. 01 02 12 21
D. 01 02 10 20

25) What prints?

found = False
for n in [2, 4, 6]:
    if n % 2:
        found = True
        break
else:
    print("All even")
A. All even
B. True
C. False
D. No output

Answer Key

1) A

2) B

3) A

4) B

5) A

6) B

7) A

8) A

9) C

10) B

11) A

12) B

13) B

14) C

15) B

16) B

17) A

18) A

19) C

20) A

21) B

22) B

23) B

24) D

25) A