Tricky Questions

Consider the following Python code:

def my_decorator(func):
    def wrapper(*args, **kwargs):
        result = func(*args, **kwargs)
        return result * 2
    return wrapper

@my_decorator
def my_function(x):
    return x + 1

result = my_function(5)
print(result)

What will be the value of result?

A:

6

B:

10

C:

12

D:

This code will result in an error.

Answer: C

The decorator multiplies the result of the function by 2.

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What is the output of the following Python code?

x = 2
y = 3
result = x * y ** x
print(result)

A:

12

B:

18

C:

24

D:

8

Answer: B

Exponentiation (**), performed before multiplication, results in 3 ** 2, and then multiplied by 2.

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What will be the output of the following Python code?

class MyClass:
    x = 10

obj = MyClass()
obj.x += 5
result = obj.x
print(result)

A:

10

B:

5

C:

15

D:

This code will result in an error.

Answer: C

The attribute x is incremented by 5 using the instance obj.

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What is the output of the following Python code?

x = [1, 2, 3]
y = x[:]
y[0] = 10
print(x)

A:

[1, 2, 3]

B:

[10, 2, 3]

C:

[10, 2, 3] (but with a warning)

D:

[1, 2, 3, 10]

Answer: A

Slicing with [:] creates a new copy of the list, so modifying y does not affect x.

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What will be the output of the following Python code?

string1 = "Python"
string2 = string1
string2 += " is great"
result = string1 + string2
print(result)

A:

"Python is greatPython is great"

B:

"PythonPython is great"

C:

"Python is great is great"

D:

This code will result in an error.

Answer: B

Immutable strings, when concatenated, create a new string.

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