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Which data skill are you focusing on now?

1. What will be the output of the following code?

def add_item(item, lst=None):
    if lst is None:
        lst = []
    lst.append(item)
    return lst

print(add_item(1))
print(add_item(2))

A. [1] then [2]
B. [1] then [1, 2]
C. [] then []
D. Raises TypeError
Correct answer: A.

2. What is printed by this code?

x = 10
def func():
    print(x)
    x = 5

func()

A. 10
B. 5
C. None
D. UnboundLocalError
Correct answer: D.

3. What is the result of executing this code?

a = [1, 2, 3]
b = a[:]
a.append(4)
print(b)

A. [1, 2, 3, 4]
B. [4]
C. [1, 2, 3]
D. []
Correct answer: C.

4. What does the following expression evaluate to?

bool("False")

A. False
B. True
C. Raises ValueError
D. None
Correct answer: B.

5. What will be the output?

print(type({}))

A. <class 'list'>
B. <class 'set'>
C. <class 'dict'>
D. <class 'tuple'>
Correct answer: C.

6. What is printed by this code?

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

A. (1, 2, [3])
B. (1, 2, [3, 4])
C. TypeError
D. AttributeError
Correct answer: C.

7. What does this code output?

print([i for i in range(3) if i])

A. [0, 1, 2]
B. [1, 2]
C. [0]
D. []
Correct answer: B.

8. What will be printed?

d = {"a": 1}
print(d.get("b", 2))

A. None
B. KeyError
C. 2
D. "b"
Correct answer: C.

9. What is the output?

print(1 in [1, 2], 1 is 1)

A. True True
B. True False
C. False True
D. False False
Correct answer: A.

10. What does this code produce?

def gen():
    for i in range(2):
        yield i

g = gen()
print(next(g), next(g))

A. 0 1
B. 1 2
C. 0 0
D. StopIteration
Correct answer: A.

11. What is printed?

print({x: x*x for x in range(2)})

A. {0, 1}
B. {0: 0, 1: 1}
C. [(0,0),(1,1)]
D. Error
Correct answer: B.

12. What is the result of this comparison?

print([] == [], [] is [])

A. True True
B. False False
C. True False
D. False True
Correct answer: C.

13. What will be printed?

def f():
    try:
        return "A"
    finally:
        print("B")

print(f())

A. A
B. B
C. B then A
D. A then B
Correct answer: C.

14. What does this code output?

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

A. [1, 2, 3]
B. [3]
C. [1, 2]
D. Error
Correct answer: C.

15. What is printed?

print(type(i for i in range(3)))

A. <class 'list'>
B. <class 'tuple'>
C. <class 'generator'>
D. <class 'range'>
Correct answer: C.

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