Understanding Python Lists

What is a list in Python?

• A list in Python is a mutable, ordered collection of items defined by square brackets.

• A list in Python is an immutable collection of items.

• A list in Python is a collection of items defined by curly braces.

• A list in Python is a fixed-size array of integers.

Answer explanation

A list in Python is defined by square brackets and is mutable, meaning its contents can be changed. This distinguishes it from immutable collections like tuples and sets, which have different characteristics.

How are items in a list separated?

• spaces

• semicolons

• commas

• dashes

Answer explanation

Items in a list are typically separated by commas. This is a standard convention in English writing, making 'commas' the correct choice among the options provided.

What symbols are used to define a list?

• Angle brackets <>

• Curly braces {}

• Square brackets []

• Parentheses ()

Answer explanation

Square brackets [] are used to define a list in programming languages like Python and JavaScript. Other symbols like angle brackets, curly braces, and parentheses serve different purposes, making square brackets the correct choice for lists.

Can you change the items in a list after it is created?

• You can only add items, not change them

• No, lists are immutable

• Yes

• Only if they are empty

Answer explanation

Yes, you can change the items in a list after it is created. Lists in Python are mutable, meaning you can modify their contents, including adding, removing, or changing items.

What will be the output of print(lst1) if lst1 = [1,2,2,3,5,4,6]?

• [2, 2, 3, 4, 5]

• [1, 2, 2, 3, 5, 4, 6]

• [1, 2, 3, 4, 5, 6]

• [1, 3, 4, 5, 6]

Answer explanation

The output of print(lst1) will be the original list itself, which is [1, 2, 2, 3, 5, 4, 6]. The other options represent modified versions of the list, but the correct choice is the unaltered list.

What type of data can be stored in a list?

• A list can only store boolean values.

• A list can only store integers.

• A list can store multiple data types such as integers, floats, strings, booleans, and other lists or objects.

• A list can only store strings.

Answer explanation

The correct choice states that a list can store multiple data types, including integers, floats, strings, booleans, and even other lists or objects. This flexibility is a key feature of lists in programming.

What is the output of print(details) if details = ['Abhijeet', 18, 'FYBScIT', 9.8]?

• ['Abhijeet', 18, 'FYBScIT']

• ['Abhijeet', 18, 9.8]

• ['Abhijeet', '18', 'FYBScIT', 9.8]

• ['Abhijeet', 18, 'FYBScIT', 9.8]

Answer explanation

The variable 'details' is a list containing four elements: a string, an integer, another string, and a float. Therefore, the output of print(details) will be exactly ['Abhijeet', 18, 'FYBScIT', 9.8], which matches the correct answer.

How do you create a list in Python?

• You create a list in Python using parentheses, e.g., my_list = (1, 2, 3).

• You create a list in Python using square brackets, e.g., my_list = [1, 2, 3].

• You create a list in Python using curly braces, e.g., my_list = {1, 2, 3}.

• You create a list in Python by calling the list() function, e.g., my_list = list(1, 2, 3).

Answer explanation

In Python, lists are created using square brackets. For example, my_list = [1, 2, 3] correctly defines a list. The other options use incorrect syntax for lists, such as parentheses for tuples or curly braces for sets.

Is the order of items in a list important?

• The order is only important for numerical lists.

• Yes, the order of items in a list is important.

• No, the order of items in a list is irrelevant.

• Only the first item in a list matters.

Answer explanation

Yes, the order of items in a list is important because it can affect the meaning and interpretation of the list. For example, in a ranked list, the position of each item conveys its significance.

Can a list contain different data types?

• A list cannot contain any data types.

• Yes, a list can contain different data types.

• Lists can only contain numbers or strings.

• No, a list can only contain one data type.

Answer explanation

Yes, a list can contain different data types, such as integers, strings, and even other lists. This flexibility is a key feature of lists in many programming languages.