Unit 2: Control Flow, Functions, and Problem-Solving - Practice Quiz

1 What does the else block execute when the if condition is false?

2 Which loop is commonly used to repeat through each item in a sequence?

3 What is a nested loop?

4 What does the break statement do inside a loop?

5 What value does this code print? count = 0; count += 1; print(count)

6 What numbers are produced by range(3)?

7 Which keyword is used to define a function in Python?

8 In greet("Sam"), what is "Sam" called?

9 Which keyword sends a value back from a function?

10 What is recursion in programming?

11 Which keyword creates a small anonymous function in Python?

12 What is the result of "Python"[0:2]?

13 Which syntax is an f-string in Python?

14 What does the string method .upper() do?

15 What does "a,b,c".split(",") return?

16 What is the result of "Hello, {}".format("Mia")?

17 What is a regular expression mainly used for?

18 What is an algorithm?

19 Which pattern is commonly used to find the total of numbers in a list?

20 What does the continue statement do inside a loop?

21 What is printed by this code?

score = 72
if score >= 90:
    grade = "A"
elif score >= 70:
    grade = "B"
else:
    grade = "C"
print(grade)

22 What is the final value of total?

total = 0
number = 1
while number <= 4:
    total += number
    number += 1

23 How many times is count += 1 executed?

count = 0
for i in range(3):
    for j in range(2):
        count += 1

24 What is printed by this code?

values = [1, 2, 3, 4, 5]
for value in values:
    if value == 3:
        continue
    if value == 5:
        break
    print(value, end=" ")

25 What is the value of count after execution?

text = "banana"
count = 0
for character in text:
    if character == "a":
        count += 1

26 What list is produced by list(range(2, 10, 3))?

27 What does the following function return when called as square(5)?

def square(number):
    return number * number

28 What is printed by this code?

def describe(name, age=18):
    print(name, age)

describe("Mina", 21)
describe("Leo")

29 What is printed by this code?

def add_tax(price):
    price *= 1.1

result = add_tax(100)
print(result)

30 What is returned by sum_down(4)?

def sum_down(n):
    if n == 0:
        return 0
    return n + sum_down(n - 1)

31 What is the result of this expression?

numbers = [1, 2, 3, 4]
result = list(map(lambda x: x * 2 + 1, numbers))

32 What is the value of result?

word = "PYTHON"
result = word[1:5:2]

33 What is printed by this code?

name = "Ava"
score = 87.456
print(f"{name}: {score:.1f}")

34 What is the value of cleaned?

text = "  Python Programming  "
cleaned = text.strip().lower().replace(" ", "-")

35 What is the result of this code?

text = "red,green,blue"
colors = text.split(",")
result = " | ".join(colors)

36 What is printed by this code?

item = "book"
price = 12.5
print("{} costs ${:.2f}".format(item, price))

37 Which pattern matches a string containing exactly three digits?

import re

38 Which strategy correctly finds the largest value in a nonempty list without using max()?

39 Which code correctly counts the number of even values in numbers?

count = 1
for n in numbers:
    if n / 2 == 0:
        count += 1

count = 0
for n in numbers:
    if n % 2 == 1:
        count += 1

count = 0
for n in numbers:
    if n % 2 != 0:
        count -= 1

count = 0
for n in numbers:
    if n % 2 == 0:
        count += 1

count = 0
for n in numbers:
    if n % 2 == 0:
        count += 1

40 Which code correctly creates a list containing the squares of the positive values in numbers?

squares = [n * n for n in numbers if n > 0]

squares = [n ** 2 for n in numbers if n == 0]

squares = [n * n for n in numbers if n < 0]

squares = [n + n for n in numbers if n > 0]

squares = [n * n for n in numbers if n > 0]

41 What is printed by this code? x, y = 8, 3\nif x % y == 0:\n result = "A"\nelif x // y == 2 and x > y:\n result = "B"\nelse:\n result = "C"\nprint(result)

42 What list is produced by list(range(10, -2, -3))?

43 What is printed by this code? total = 0\nfor i in range(1, 4):\n for j in range(i, 4):\n total += i * j\nprint(total)

44 What is printed? values = []\nfor n in range(2, 10):\n if n % 2 == 0:\n continue\n if n > 6:\n break\n values.append(n)\nprint(values)

45 Which expression correctly counts the number of overlapping occurrences of "ana" in "banana"?

46 What is printed by this code? def update(items=[]):\n items.append(len(items))\n return items\n\nprint(update())\nprint(update())

47 What happens when this code runs? def f(a, b=2, *args, **kwargs):\n return a + b + len(args) + len(kwargs)\n\nprint(f(5, 3, 7, 8, x=1))

48 What is printed by this code? def transform(x):\n if x < 0:\n return\n return x * 2\n\nprint(transform(-1), transform(4))

49 What is printed by this function call? def f(n):\n if n <= 1:\n return 1\n return n * f(n - 2)\n\nprint(f(6))

50 What is the result of sorted([(1, 4), (2, 1), (1, 2)], key=lambda p: (p[0], -p[1]))?

51 What is printed by s = "algorithm"; print(s[-2:1:-2])?

52 What is printed by x = 12.3456; print(f"{x:08.2f}")?

53 What is the result of " A\tB\n".strip().replace("\t", "-").lower()?

54 What is printed by text = "a,,b,"; print("|".join(text.split(",")))?

55 What is printed by template = "{1}-{0}:{1}"; print(template.format("x", "y"))?

56 Using Python's re.findall, what does re.findall(r"\b\w+\b", "hi, 42 times!") return?

57 A sorted list may contain duplicates. Which strategy finds whether two distinct elements sum to a target in time and extra space?

58 Which code correctly returns the first character in s whose frequency is exactly one, or None if no such character exists?

59 What is printed by this code? n = 19\nsteps = 0\nwhile n > 1:\n n = n // 2\n steps += 1\nprint(n, steps)

60 What does pal("racecar", 0, 6) return? def pal(s, left, right):\n if left >= right:\n return True\n return s[left] == s[right] and pal(s, left + 1, right - 1)