Mastering Python Data Structures

What method would you use to add an element to a list in Python?

• Use the 'extend()' method.

• Use the 'add()' method.

• Use the 'insert()' method.

• Use the 'append()' method.

Explain how to create a dictionary comprehension to generate a dictionary of squares from a list of numbers.

• {x: x**2 for x in numbers}

• {x: x^2 for x in numbers}

• {x: x*2 for x in numbers}

• {x: x+1 for x in numbers}

How do you slice an array to get the first three elements?

• array.slice(3)

• array.slice(0, 3)

• array.slice(1, 4)

• array.slice(0, 2)

What is the difference between mutable and immutable types in Python?

• Mutable types cannot be changed; immutable types can be changed after creation.

• Both mutable and immutable types can be changed at any time.

• Mutable types are faster than immutable types in all cases.

• Mutable types can be changed; immutable types cannot be changed after creation.

How can you remove an item from a list by its value?

• Use del list[value] to delete an item by its value.

• Use list.pop(index) to remove an item by its index.

• Use list.clear(value) to remove all items from the list.

• Use list.remove(value) to remove an item by its value.

Write a dictionary comprehension that creates a dictionary from two lists: keys and values.

• {key: values[key] for key in range(len(keys))}

• {key: value for key in keys}

• {key: value for key, value in zip(keys, values)}

• {key: values[key] for key in keys}

What will be the output of the following code: arr = [1, 2, 3, 4]; print(arr[1:3])?

• [2, 3]

• [1, 2]

• [1, 2, 3, 4]

• [3, 4]

Explain why tuples are considered immutable in Python.

• Tuples can be modified after creation.

• Tuples allow adding or removing elements freely.

• Tuples are mutable and can change their size.

• Tuples are immutable because their elements cannot be changed after creation.

How can you check if a key exists in a dictionary?

• Use 'key in dictionary' or 'dictionary.get(key)'.

• Use 'dictionary.contains(key)'

• Use 'dictionary.has_key(key)'

• Check 'key in list'

What is the result of concatenating two lists in Python?

• The result is a tuple containing both lists.

• The result of concatenating two lists is an error.

• The result is a single integer value.

• The result of concatenating two lists is a new list containing all elements from both lists.