Python Lists

What is the simplest way to create a new list in Python?

• Using angle brackets <>

• Using square brackets []

• Using curly braces {}

• Using parentheses ()

Answer explanation

The simplest way to create a new list in Python is by using square brackets []. This syntax allows you to define a list directly, while angle brackets, curly braces, and parentheses are used for other data types like sets and tuples.

What is the result of the expression 'len([])'?

• 1

• 0

• None

• Error

Answer explanation

The expression 'len([])' calculates the length of an empty list. Since there are no elements in the list, the length is 0. Therefore, the correct answer is 0.

Which operator is used to concatenate two lists in Python?

• +

• *

• |

• &

Answer explanation

In Python, the '+' operator is used to concatenate two lists, combining their elements into a new list. The other operators listed do not perform list concatenation.

What does the 'append' method do in a list?

• Removes an element from the list

• Reverses the order of the list

• Sorts the list in ascending order

• Adds a new element to the end of the list

Answer explanation

The 'append' method in a list adds a new element to the end of the list. This is different from removing elements, reversing order, or sorting, making 'adds a new element to the end of the list' the correct choice.

How can you check if two variables refer to the same object in Python?

• Using the 'in' operator

• Using the 'is' operator

• Using the '==' operator

• Using the '!=' operator

Answer explanation

To check if two variables refer to the same object in Python, use the 'is' operator. This operator compares the identities of the objects, while '==' checks for value equality. Thus, 'is' is the correct choice.

What is the term for a list that is an element of another list?

• Sublist

• Nested list

• Inner list

• Child list

Answer explanation

A 'nested list' refers to a list that contains other lists as its elements. This term accurately describes the relationship where one list is an element of another, distinguishing it from other options like 'sublist' or 'inner list'.

What will be the output of 'sorted([3, 1, 2])'?

• [3, 2, 1]

• [2, 1, 3]

• [1, 2, 3]

• [3, 1, 2]

Answer explanation

The 'sorted()' function returns a new list containing all items from the iterable in ascending order. For the input [3, 1, 2], the sorted output is [1, 2, 3], making it the correct choice.

What is the result of 't.remove('d')' if 'd' is not in list t?

• Returns None

• Removes the first element

• Does nothing

• Raises a ValueError

Answer explanation

The method 't.remove('d')' raises a ValueError if 'd' is not found in the list 't'. This is because remove() expects the item to be present, and its absence triggers an error.

Which method would you use to split a string into a list of words?

• divide

• join

• split

• partition

Answer explanation

The correct method to split a string into a list of words is 'split'. This method divides the string at specified delimiters, returning a list of substrings, which are the individual words.

What is the term for the binding of a variable to a value in programming?

• Assignment

• Pointer

• Link

• Connection

Answer explanation

The term 'Assignment' refers to the process of binding a variable to a specific value in programming. This is a fundamental concept, allowing variables to store and manipulate data.