Unit 1: Python basics - Practice Quiz

1 Which file extension is commonly used for Python source files?

2 Which function displays output on the screen in Python?

3 Which symbol begins a single-line comment in Python?

4 Which function accepts input from the user in Python?

5 Which of the following is a valid Python variable name?

6 Which Python data type stores whole numbers?

7 What is the data type of the value 3.14 in Python?

8 Which operator is used for exponentiation in Python?

9 What is the result of 10 % 3?

10 Which operator checks whether two values are equal?

11 Which keyword begins a conditional statement in Python?

12 Which keyword provides an alternative when an if condition is false?

13 Which loop is commonly used to iterate over a sequence in Python?

14 Which statement immediately exits the nearest loop?

15 Which statement skips the rest of the current loop iteration?

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

17 What is the purpose of the return statement in a function?

18 In def greet(name):, what is name?

19 How do you call a function named show that takes no arguments?

20 Which built-in function returns the number of items in a list?

21 What is printed by the following code?

x = 10

x = "10"

print(x * 2)

22 A file named tools.py contains:

print("loaded")

if __name__ == "__main__":

print("running")

What is printed when another program executes import tools?

23 What is the output of this simultaneous assignment?

a, b = 2, 3

a, b = b, a + b

print(a, b)

24 What does this program print?

total = 4

Total = 7

TOTAL = total + Total

print(TOTAL)

25 What is printed by print(type((5,)).__name__, type((5)).__name__)?

26 What is the output of print(-7 // 3, -7 % 3)?

27 What is printed by the following code?

a = [1, 2]

b = a

c = a[:]

b.append(3)

print(c, a)

28 What is the output of this dictionary operation?

d = {"a": 1, "b": 2, "a": 3}

print(len(d), d["a"])

29 Which set is produced by {1, 2, 3} & {2, 3, 4} | {4, 5}?

30 What value is printed by print(-2 ** 2 + 2 ** 3)?

31 What is printed by the following loop?

total = 0

for n in range(2, 10, 3):

total += n

print(total)

32 Which letter is printed by this conditional?

x = 8

if x % 2 == 0 and x > 10:

print("A")

elif x % 2 == 0 or x > 10:

print("B")

else:

print("C")

33 What value is printed after this loop?

n = 20

count = 0

while n > 1:

n //= 2

count += 1

print(count)

34 What is the final value of result?

result = []

for n in range(2, 10):

if n % 3 == 0:

continue

if n > 7:

break

result.append(n)

35 What is printed by these nested loops?

count = 0

for i in range(1, 4):

for j in range(1, 4):

if i == j:

continue

count += 1

print(count)

36 What is printed by the following code?

def add_item(item, items=[]):

items.append(item)

return items

print(add_item(1))

print(add_item(2))

37 What is the output of this program?

x = 10

def change():

x = 3

return x

print(change(), x)

38 What value is returned by calculate(3, 4, 5, 6)?

def calculate(a, b=2, *numbers):

return a + b + sum(numbers)

39 What is printed by this function call?

def divide_parts(n):

return n // 2, n % 2

q, r = divide_parts(7)

print(q, r)

40 What is the value of ordered after this statement?

words = ["pear", "fig", "apple", "kiwi"]

ordered = sorted(words, key=lambda word: (len(word), word))

41 What is printed by the following code?

a = [0, 0]
i = 0
i, a[i] = 1, 7
print(a, i)

42 Assuming no future imports, what is printed?

def f(x: int = '3') -> int:
    return x * 2

print(f(), f(4))

43 What happens when this code is executed?

x = 10

def f(flag):
    if flag:
        x = 20
    return x

print(f(False))

44 In Python 3.10 or later, what is printed by this module-level code?

x = 100
s = [x := x + i for i in range(3)]
print(x, s, 'i' in globals())

45 A file named m.py contains only print(__name__). What does it print when run directly, and what does it print when first imported as m by another script?

46 What is printed by the following code?

x = [1, 2]
y = x
x += [3]
z = x
x = x + [4]
print(y, z, x, y is z, z is x)

47 What is printed?

result = 0 or [] or 'py' and 5
print(result, type(result).__name__)

48 What is printed by this dictionary code?

d = {True: 'A', 1: 'B', 1.0: 'C'}
print(len(d), list(d.keys()), d[1])

49 What is printed by these slices?

a = [0, 1, 2, 3, 4, 5]
print(a[5:0:-2], a[::-2])

50 What exact text is printed?

def f(v):
    print(v, end='')
    return v

print(f(3) < f(2) < f(1))

51 What exact text is printed?

for i in range(3):
    try:
        if i == 1:
            continue
        print(i, end='')
    finally:
        print('F', end='')

52 What is printed?

n = 3
while n:
    n -= 1
    if n == 1:
        break
else:
    print('E', end='')
print(n)

53 What exact text is printed?

for i in range(4):
    for j in range(4):
        if i * j > 2:
            break
    else:
        print(i, end='')

54 What is printed by the following code?

def g(x):
    try:
        r = 10 // x
    except ZeroDivisionError:
        r = 0
    else:
        r += 1
    finally:
        r *= 2
    return r

print(g(2), g(0))

55 What is printed by this comprehension?

print([i for i in range(6) if i % 2 if i % 3])

56 What is printed?

def f(x, acc=[]):
    acc += [x]
    return acc

a = f(1)
b = f(2, [])
c = f(3)
print(a, b, c, a is c)

57 What is printed by these functions?

funcs = []
for i in range(3):
    funcs.append(lambda x=i: x + i)
i = 10
print([f() for f in funcs])

58 In Python 3.10 or later, which call raises TypeError?

def f(a, /, b=2, *, c=3):
    return a + b + c

59 What is printed after applying these decorators?

def deco(tag):
    def outer(fn):
        def inner():
            return tag + fn() + tag
        return inner
    return outer

@deco('A')
@deco('B')
def f():
    return 'X'

print(f())

60 What is printed by this generator code?

def gen():
    yield 1
    return 7

g = gen()
a = next(g)
try:
    next(g)
except StopIteration as e:
    b = e.value
print(a, b)