Python Output Questions with Answers (Predict the Output)

Question 1

What does this code print?
nums = [20, 20, 20, 90, 30]
print(nums[3:5])

Accepted Answer

[90, 30]. A slice [start:stop:step] includes start but stops before stop; negative numbers count from the end. nums[3:5] is [90, 30].

Question 2

What does this code print?
nums = [70, 70, 10, 40, 20, 20, 90]
print(nums[-1::-2])

Accepted Answer

[90, 20, 10, 70]. A slice [start:stop:step] includes start but stops before stop; negative numbers count from the end. nums[-1::-2] is [90, 20, 10, 70].

Question 3

What does this code print?
a = 15
b = 7
print(a // b, a % b)

Accepted Answer

2 1. In Python, // rounds down (towards −∞) and % has the same sign as the divisor, so 15 // 7 = 2 and 15 % 7 = 1.

Question 4

What does this code print?
a = 36
b = 4
print(a // b, a % b)

Accepted Answer

9 0. In Python, // rounds down (towards −∞) and % has the same sign as the divisor, so 36 // 4 = 9 and 36 % 4 = 0.

Question 5

What does this code print?
s = "keyboard"
print(s[1], s[-1], len(s * 3))

Accepted Answer

e d 24. Indexes start at 0, s[-1] counts from the end, and s * 3 repeats the word 3 times (8 × 3 = 24 characters).

Question 6

What does this code print?
s = "program"
print(s[2], s[-4], len(s * 3))

Accepted Answer

o g 21. Indexes start at 0, s[-4] counts from the end, and s * 3 repeats the word 3 times (7 × 3 = 21 characters).

Question 7

What does this code print?
print(sum(range(3, 18, 2)))

Accepted Answer

80. range(3, 18, 2) gives 3, 5, 7, 9, 11, 13, 15, 17 (stop is not included). Their sum is 80.

Question 8

What does this code print?
print(sum(range(5, 13, 1)))

Accepted Answer

68. range(5, 13, 1) gives 5, 6, 7, 8, 9, 10, 11, 12 (stop is not included). Their sum is 68.

Question 9

What does this code print?
a = [1, 2]
b = a[:]
b.append(9)
print(len(a))

Accepted Answer

2. a[:] makes a new copy, so appending to b does not change a.

Question 10

What does this code print?
a = [1, 2]
b = a
b.append(7)
print(len(a))

Accepted Answer

3. b = a does not copy the list: both names point to the same list, so a also grows.

Question 11

What does this code print?
i = 3
count = 0
while i < 100:
    i = i * 3
    count += 1
print(count, i)

Accepted Answer

4 243. i goes 3 → 9 → 27 → 81 → 243; the loop runs 4 times and stops once i reaches 243.

Question 12

What does this code print?
i = 1
count = 0
while i < 50:
    i = i * 2
    count += 1
print(count, i)

Accepted Answer

6 64. i goes 1 → 2 → 4 → 8 → 16 → 32 → 64; the loop runs 6 times and stops once i reaches 64.

Question 13

What does this code print?
d = {'b': 7, 'c': 7, 'a': 5}
d['c'] = 12
print(len(d), d.get('c', 0))

Accepted Answer

3 12. Assigning to an existing key replaces its value; a new key adds an entry. get() returns the default 0 when the key is missing.

Question 14

What does this code print?
d = {'a': 8, 'c': 5, 'b': 7}
d['c'] = 17
print(len(d), d.get('x', 0))

Accepted Answer

3 0. Assigning to an existing key replaces its value; a new key adds an entry. get() returns the default 0 when the key is missing.

Question 15

What does this code print?
print([i * i for i in range(6) if i % 2 == 0])

Accepted Answer

[0, 4, 16]. range(6) is 0..5; keep the multiples of 2 (0 counts!) and square them: [0, 4, 16].

Question 16

What does this code print?
print([i * i for i in range(7) if i % 2 == 0])

Accepted Answer

[0, 4, 16, 36]. range(7) is 0..6; keep the multiples of 2 (0 counts!) and square them: [0, 4, 16, 36].

Question 17

What does this code print?
count = 0
for i in range(4):
    for j in range(i, 7):
        count += 1
print(count)

Accepted Answer

22. For each i the inner loop runs 7 − i times: 7 + 6 + 5 + 4 = 22.

Question 18

What does this code print?
count = 0
for i in range(5):
    for j in range(i, 6):
        count += 1
print(count)

Accepted Answer

20. For each i the inner loop runs 6 − i times: 6 + 5 + 4 + 3 + 2 = 20.

Question 19

What does this code print?
def f(n):
    if n <= 1:
        return 1
    return n + f(n - 1)

print(f(6))

Accepted Answer

21. f(6) = 6 + 5 + 4 + 3 + 2 + 1 = 21.

Question 20

What does this code print?
def f(n):
    if n <= 1:
        return 1
    return n + f(n - 1)

print(f(3))

Accepted Answer

6. f(3) = 3 + 2 + 1 = 6.

Question 21

What does this code print?
a, b = 4, 8
print(a & b, a | b, a ^ b, a << 1)

Accepted Answer

0 12 12 8. In binary a = 100, b = 1000. & keeps bits set in both, | in either, ^ in exactly one; << 1 multiplies by 2.

Question 22

What does this code print?
a, b = 3, 8
print(a & b, a | b, a ^ b, a << 2)

Accepted Answer

0 11 11 12. In binary a = 11, b = 1000. & keeps bits set in both, | in either, ^ in exactly one; << 2 multiplies by 4.

Question 23

What does this code print?
s = "pink,green,red,"
print(len(s.split(",")), s.count("e"))

Accepted Answer

4 3. split(",") keeps empty strings between consecutive commas, giving 4 pieces; "e" appears 3 times.

Question 24

What does this code print?
s = "pink,,,red,blue"
print(len(s.split(",")), s.count("r"))

Accepted Answer

5 1. split(",") keeps empty strings between consecutive commas, giving 5 pieces; "r" appears 1 time.

Question 25

What does this code print? (sorted() is stable: equal keys keep their original order.)
words = ['plum', 'mango', 'kiwi', 'banana']
print(sorted(words, key=len, reverse=True))

Accepted Answer

['banana', 'mango', 'plum', 'kiwi']. key=len sorts by word length, longest first; words of equal length keep their original order.

Question 26

What does this code print? (sorted() is stable: equal keys keep their original order.)
words = ['apple', 'banana', 'plum', 'dates']
print(sorted(words, key=len))

Accepted Answer

['plum', 'apple', 'dates', 'banana']. key=len sorts by word length; words of equal length keep their original order.

Question 27

What does this code print?
x, y, z = 5, 4, 9
flag = True
print(x > y and y > z or not flag)

Accepted Answer

False. not binds tightest, then and, then or: (x > y and y > z) is False, not flag is False, so the result is False.

Question 28

What does this code print?
x, y, z = 8, 4, 2
flag = False
print(x > y and y > z or not flag)

Accepted Answer

True. not binds tightest, then and, then or: (x > y and y > z) is True, not flag is True, so the result is True.

Python Output Questions with Answers (Predict the Output)

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Q25. What does this code print? (sorted() is stable: equal keys keep their original order.)

Q26. What does this code print? (sorted() is stable: equal keys keep their original order.)

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