Python Dictionary Comprehension

Question 1

Which of the following python versions introduced dictionary comprehension?

Python 2.7

Python 3.0

Python 3.1

Python 2.5

Question 2

Which of the following statements is true regarding dictionary comprehension?

You can only create dictionaries from lists.

You cant use conditional statements in dictionary comprehensions.

Dictionary comprehensions can be nested.

Dictionary comprehensions can't be used with string values.

Question 3

What does the following dictionary comprehension do?

{k: k**2 for k in range(1,6)}

Creates a dictionary with keys as squares of integers from 1 to 5.

Raises an error because k**2 is not a valid expression.

Creates a dictionary with keys as integers from 1 to 5 and values as their squares.

Removes all odd numbers from the dictionary.

Question 4

What is the advantage of using dictionary comprehension over traditional methods of creating dictionaries?

It is faster and more memory-efficient.

It allows you to create dictionaries with fewer key-value pairs.

It automatically sorts the keys in alphabetical order.

All of the above.

Question 5

What is the basic structure of a dictionary comprehension?

for key, value iterable.

for key, value in iterable if condition.

for key, value in iterable while condition.

if key, value in iterable.

Question 6

What is the result of the following dictionary comprehension?

{k: v for k, v in {a: 1, b: 2, c: 3}.items() if v > 1}

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

{a: 1, b: 2}

{b: 2, c: 3}

Raises an error because it's not a valid dictionary comprehension.

Question 7

Which symbol is used to enclose a dictionary comprehension in python?

Parentheses( )

Curly braces{ }

Square brackets[ ]

None of the above.

Question 8

In a dictionary comprehension, what does the key represent in the expression key: value?

The value associated with the key.

The key itself.

A variable that you can use to represent each key in the iterable.

A placeholder for a value.

Question 9

How can you conditionally include items in a dictionary comprehension?

By using an if statement after the for clause.

By using a separate if function.

By using a separate filter() function.

By using an else statement.

Question 10

What is dictionary comprehension in python?

A method to create dictionaries by specifying keys and values separately.

A way to filter dictionaries based on a condition.

A concise way to create dictionaries using a single line of code.

A method to access elements in a dictionary.

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