Chapter 10 - Lists and Tuples

Question 1

How are lists similar to strings?

Answer 1

• lists are sequences, and therefore support indexing and slicing (like strings).
• lists are objects, and contain methods which you can call (just as strings do)

Question 2

How are lists different from strings?

Answer 2

• lists may contain different data types.
• lists are mutable, meaning they can be altered after they are created.

Question 3

How do we access a item in a list?

Answer 3

indexing and slicing.

Question 4

How do we add an item to a list?

Answer 4

append
ex. x.append(19)

Question 5

How do we delete an item from a list?

Answer 5

del
ex. del z[1]

Question 6

What is the general syntax for selecting items with a list comprehension?

Answer 6

[x for x in sequence if expression]
Where sequence is any sequence and expression is an expression involving x. Each item x from sequence is selected and added to the resulting list if the expression involving x evaluates to true.

Question 7

What is the general syntax for computing something using each item in a list?

Question 8

What are the differences between a list and a tuple?

Answer 8

• tuples are immutable.
• tuples are written with parenthesis instead of square brackets.

Question 9

In what type of situations would we want to use a tuple instead of a list?

Answer 9

Software engineering because tuples prevent accidental modification.