Lists

Question 1

What is a list

Answer 1

A data structure that helps store and manipulate an ordered collection of items.

Question 2

List could contain what types of data?

Answer 2

Int.
Float
Strings
Other lists

Question 3

What are the common methods for working with lists?

Answer 3

append, insert, remove, pop, clear, index, count,sort

Question 4

What are the two main ways to create a list?

Answer 4

1. Square brackets
   e.g x= [1,2]
2. List function
   e.g x= list(1,2)

Question 5

[1,2,3,4,5]
[0:4]
What will be the result and why

Answer 5

1234
The last item is not included when accessing list

Question 6

How do you mutate a list

Answer 6

Specify the position you want to mutate along with the item
e.g x = [1,2,3,4]
x[2] = 7
This will give a new list such that;
x= 1,2,7,4
This differs from insert as insert only adds to the list.

Question 7

List operators?

Answer 7

1. Addition
2. Multiplication
   Note: lists can not be subtracted or divided

Question 8

x=[1,2,3]
y=[a,b,c]
x+y
What will be the output

Answer 8

[1,2,3,’a’,’b’,’c’]

Question 9

x=[1,2,3]
x*2
What will be the output

Answer 9

[1,2,3,1,2,3]

Question 10

How do you use the methods in lists?

Answer 10

list_name.method(variable)
Some times positions may be required as in insert
List_name.method(index, variable)

Question 11

Pop

Answer 11

Removes the item in a given position and return it. If no index is specified, it will remove the last item in the list

Question 12

How do you sort in descending order?

Answer 12

list.sort(reverse = true)