Lists

Question 1

List are:

Answer 1

• Ordered sequences that can hold a variety of object types.
• [] Brackets and commas to separate objects in list [1,2,3,4,5]
• List support indexing and slicing
• List can be nested and also ave a variety of useful methods that ce called off of them.

Question 2

List examples:

Answer 2

my_list = [1,2,3,4]

my_list2 = [‘STRING’,100,23.3]

Question 3

Cancatinate 2 list

mylist = [‘one’,’two’,’three’]

another_list = [‘apple’,’pie’,’cherry’]

Answer 3

mylist + another_list

Question 4

Combine two list

mylist = [‘one’,’two’,’three’]

another_list = [‘apple’,’pie’,’cherry’]

Answer 4

mynewlist = mylist + another_list

Question 5

Change the first string in this list to “One for all’

new_list = [‘one’, ‘two’, ‘three’, ‘four’, ‘five’]

Answer 5

new_list[0] = ‘One for all’

would change it to

new_list = [‘One for all’, ‘two’, ‘three’, ‘four’, ‘five’]

Question 6

Add an element to the end of a list:

Answer 6

new_list.

new_list.append(‘six’)

new_list = [‘One for all’, ‘two’, ‘three’, ‘four’, ‘five’, ‘six’]

NOTE:This affects the list in place

Question 7

Remove the last element from a list:

Answer 7

Done using pop

new_list.pop()

new_list = [‘One for all’, ‘two’, ‘three’, ‘four’, ‘five’, ‘six’]

Question 8

Remove an element from the 3 position

new_list = [‘One for all’, ‘two’, ‘three’, ‘four’, ‘five’, ‘six’]

Answer 8

new_list.pop(3)

new_list = [‘One for all’, ‘two’, ‘three’, ‘five’, ‘six’]

Question 9

Sort list

new_list = [‘a’, ‘e’, ‘x’, ‘b’, ‘c’]

num_list = [4,1,8,3]

Answer 9

Call the sort method

new_list.sort()

NOTE:This sorts the list in place

Question 10

Reassign this list but first Sort list

new_list = [‘a’, ‘e’, ‘x’, ‘b’, ‘c’]

num_list = [4,1,8,3]

Answer 10

new_list.sort()

my_sorted_list = new_list

Question 11

Reverse this list

new_list = [‘a’, ‘e’, ‘x’, ‘b’, ‘c’]

num_list = [4,1,8,3]

Answer 11

• Call the reverse method
• num_list.reverse()

[3,8,1,4]

• new_list.reverse()

[‘c’, ‘b’, ‘e’, ‘a’]

Question 12

How do I index a nested list? For example if I want to grab 2 from [1,1,[1,2]]?

Answer 12

You would just add another set of brackets for indexing the nested list, for example:

my_list[2][1]

NOTE: List follow the same numbering sequence as strings.

Question 13

If lst=[0,1,2] what is the result of lst.pop()

Answer 13

2

Question 14

Lists can have multiple object types.

Answer 14

True

Question 15

If lst=[‘a’,’b’,’c’] What is the result of lst[1:]?

Answer 15

[‘b’,’c’]