ExamAdept

What is the output of the following code:

my_dict = {"a": 1, "b": 2}
my_dict["c"] = 3
print(my_dict)

A:

{"a": 1, "b": 2}

B:

{"a": 1, "b": 2, "c": 3}

C:

{"c": 3}

D:

An error is raised

Answer: B

In this code, a dictionary my_dict is defined with two key-value pairs.

The second line adds a new key "c" with the value 3 to the dictionary.

When the modified dictionary is printed to the console, the output is {"a": 1, "b": 2, "c": 3}.

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Which of the following is true about the pass statement?

A:

It is a keyword used to create empty code blocks.

B:

It is used to terminate a loop or a function.

C:

It is used to raise an exception.

D:

It is not a valid keyword in Python.

Answer: A

The pass statement in Python is used as a placeholder for code that has not been implemented yet.

It is a keyword that creates an empty code block and does nothing. It is commonly used when defining functions, loops, and conditional statements that will be filled in later.

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What is the output of the following code:

x = 5
y = x
x = 10
print(y)

A:

5

B:

10

C:

An error is raised

D:

None of the above

Answer: A

In this code, a variable x is assigned the value 5, and a variable y is assigned the same value by copying the value of x.

The value of x is then changed to 10, but the value of y remains unchanged at 5.

When the value of y is printed to the console, the output is 5.

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Which of the following is NOT a valid way to declare a tuple?

A:

my_tuple = 1, 2, 3

B:

my_tuple = (1, 2, 3)

C:

my_tuple = tuple(1, 2, 3)

D:

All of the above are valid

Answer: C

my_tuple = tuple(1, 2, 3) is not a valid way to declare a tuple in Python.

Instead, you can use my_tuple = 1, 2, 3 or my_tuple = (1, 2, 3) to create a tuple directly, or use the tuple() function to convert another iterable (like a list) into a tuple.

For example: my_tuple = tuple([1, 2, 3])

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What is the output of the following code:

my_list = [1, 2, 3, 4]
my_list[1:3] = [5, 6]
print(my_list)

A:

[1, 2, 3, 4]

B:

[1, 5, 6, 4]

C:

[1, 2, 5, 6, 4]

D:

An error is raised

Answer: B

In this code, a list my_list is defined with four elements.

The second line uses slice assignment to replace the second and third elements of the list with the new list [5, 6].

When the modified list is printed to the console, the output is [1, 5, 6, 4].

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Questions for: Variables