Python Tuples

What is a key characteristic of tuples that differentiates them from lists?

• Tuples can only contain integers.

• Tuples can only contain strings.

• Tuples are immutable.

• Tuples are mutable.

Answer explanation

A key characteristic of tuples is that they are immutable, meaning their contents cannot be changed after creation. This differentiates them from lists, which are mutable and allow modifications.

Which of the following is a correct way to create a tuple with a single element?

• t = 'p'

• t = 'p',

• t = ('p')

• t = ('p',)

Answer explanation

To create a tuple with a single element, you must include a comma after the element. Thus, 't = ("p",)' is correct. The other options either create a string or do not properly define a tuple.

What will be the result of the expression: tuple('spam') * 2?

• ('spam',)

• ('s', 'p', 'a', 'm', 's', 'p', 'a', 'm')

• ('s', 'p', 'a', 'm')

• ('spam', 'spam')

Answer explanation

The expression tuple('spam') creates a tuple with a single element 'spam'. When multiplied by 2, it repeats the contents of the tuple, resulting in ('s', 'p', 'a', 'm', 's', 'p', 'a', 'm'), which is the correct answer.

Which function can be used to sort a tuple?

• sort()

• sorted()

• arrange()

• order()

Answer explanation

The function 'sorted()' is used to sort any iterable, including tuples, and returns a new sorted list. The 'sort()' method is for lists only, while 'arrange()' and 'order()' are not valid Python functions for sorting.

What error is raised when trying to modify a tuple?

• IndexError

• TypeError

• ValueError

• AttributeError

Answer explanation

Tuples are immutable in Python, meaning their contents cannot be changed. Attempting to modify a tuple raises a TypeError, indicating that an operation is not allowed on the data type.

What is the result of the following code: divmod(7, 3)?

• (2, 1)

• (1, 2)

• (3, 1)

• (2, 3)

Answer explanation

The divmod function returns a tuple containing the quotient and the remainder of the division. For divmod(7, 3), 7 divided by 3 gives a quotient of 2 and a remainder of 1, resulting in (2, 1). Thus, the correct answer is (2, 1).

Which of the following is a valid use of tuple assignment?

• a, b = 1, 2, 3

• a, b = '12'

• a, b = (1, 2)

• a, b = [1, 2]

Answer explanation

The correct choice is 'a, b = (1, 2)' because it uses tuple assignment correctly, unpacking the tuple (1, 2) into variables a and b. The other options either have too many values or are not tuples.

What is the result of the following code: max((0, 1, 2), (0, 3, 4))?

• (0, 3, 2)

• (0, 3, 4)

• (0, 1, 4)

• (0, 1, 2)

Answer explanation

The max function compares the tuples element-wise. It finds the maximum for each position: (0, 1, 2) vs (0, 3, 4) gives (0, max(1, 3), max(2, 4) = (0, 3, 4). Thus, the correct answer is (0, 3, 4).

Is the following piece of code valid?

>>> a=(1,2,3,4)

>>> del a

• No because tuple is immutable

• Yes, the entire tuple is deleted

• No, invalid syntax for del method

• Yes, first element in the tuple is deleted

Answer explanation

The code is valid because using 'del a' removes the entire tuple 'a' from memory. Tuples are immutable, but that does not prevent you from deleting the variable that references the tuple.

Which of the following is true for a tuple?

• Tup = 1,2,3

• Tup = (""1,"2)

• Tup = (1,2,3,4)

• None of the above

Answer explanation

The correct choice is 'Tup = (1,2,3,4)' because it correctly defines a tuple in Python using parentheses. The other options either lack parentheses or have incorrect syntax.