Tricky Questions

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: B

y is assigned a reference to the same list as x, so modifying y also modifies x.

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What is the output of the following Python code?

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

A:

6

B:

8

C:

9

D:

1

Answer: C

The double asterisk (**) is the exponentiation operator, and 3 raised to the power of 2 is 9.

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What will be the output of the following Python code?

x = "Python"
y = x.lower()
z = x.upper()
result = y + z
print(result)

A:

"PythonPYTHON"

B:

"pythonPYTHON"

C:

"pythonPYTHONpython"

D:

This code will result in an error.

Answer: B

The lower() method makes the string lowercase, and upper() makes it uppercase.

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What is the output of the following Python code?

def modify_list(my_list):
    my_list = [0, 1, 2]

original_list = [1, 2, 3]
modify_list(original_list)
print(original_list)

A:

[0, 1, 2]

B:

[1, 2, 3]

C:

This code will result in an error.

D:

None

Answer: B

The function reassigns my_list to a new list, but it does not modify the original list outside the function.

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Consider the following Python code:

def my_generator():
    yield 1
    yield 2
    yield 3

result = list(my_generator())
print(result)

What will be the output of this code?

A:

[1, 2, 3]

B:

(1, 2, 3)

C:

{1, 2, 3}

D:

This code will result in an error.

Answer: A

The generator function is converted to a list using the list() constructor.

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Questions for: Tricky Questions