Homework.py Lesson 6

[Willow0584]

Homework: Lists

🔥Read carefully until the end before you start solving the exercises🔥

Practice the Basics 💪🏻

Empty, Pre-populated, and Lists within Lists

You can uncomment or type the necessary code on each task

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Task 1. Create three lists:

List #1: Create an empty list and then use append() to populate it with the names of three of your friends.

List #2: Create the same list, but use the syntax to create it pre-populated.

List #3: Create the same list, but each element should be a list,

where the first sub-element is the friend's name

and the second sub-element is their age.

List 1:

list_1 = []

list_1.append('Jane')

list_1.append('Janet')

list_1.append('Jenny')

List 2:

list_2 = [Jane, Janet, Jenny]

List 3:

list_3 = [['Jane',22], ['Janet',24], ['Jenny',26]]

'Jane', 22

'Janet', 24

'Jenny', 26

]

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Task 2. Retrieve elements from a List

Create print statements to retrieve the following elements from the previous lists:

- From List 2: Retrieve the name of the second friend.

- From List 3: Retrieve the age of the last friend you put in the list.

Name of second friend

second_friend_name = list_2['Janet']

Age of the last friend of the list

last_friend_age = list_3[;Jenny']['26']

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Task 3. Remove elements from a List

From the lists provided, remove the requested elements. Easy peazy.

cities = ["Houston", "Dallas", "Austin"]

fruits = ["apple", "banana", "orange"]

Remove Austin from cities without using its index

cities.remove("Austin")

Remove the last element from fruits using negative indexes

print(fruits[-1])

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Task 4. Verify if an element exists in a list

Given the provided list, write code that prints YES if the list contains the word cheese

The list

pantry = ["ham", "bread", "cheese"]

Write code that prints YES if the list contains "cheese".

if "cheese" in pantry:

# print('YES')

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Task 5. Sorting and Reversing

Given the provided list, write code that sorts and reverses it, as required.

numbers = [6, 34, 17, 9, 2, 11, 57, 9, 32]

Write code that sorts the list in ascending order without disturbing the original.

sorted_numbers = sorted(numbers)

print(sorted_numbers)

Write code that reverses (flips) the list without disturbing the original.

Remember that in this case, casting is required.

reversed_numbers = list(reversed(numbers))

print(reversed_numbers)

Write code that sorts the list in place, modifying the original.

numbers.sort()

print(numbers)

Write code that reverses (flips) the list in place, modifying the original.

numbers.reverse()

print(numbers)

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Task 6. Stitching and Slicing

You are given two lists with names of days of the week:

- work_days= ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday']

- rest_days ['Saturday', 'Sunday']

Create a third list that contains the concatenation of the previous two.

Call it 'full_week'

full_week = work_days + rest_days
print(full_week)

Now, write python code that prints a slice from 'full_week' with the work days.

work_days = ['mon', 'tue', 'wed', 'thu', 'fri']

rest_days = ['sat', 'sun']

Concatenate work_days and rest_rays

full_week = work_days + rest_days

Slice with the work days

print(full_week[0.5])

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Task 7. Aggregators and Helpers

Given a list of numbers, use helpers and aggregators to answer the questions:

- What's the lowest number?

- What's the highest number?

- What's the sum of all the numbers in the list?

- How many times is the number 9 in the list?

- How many total elements are in the list?

numbers = [6, 34, 17, 9, 2, 11, 57, 9, 32]

Lowest number

print(min(numbers))

Highest number

print(max(numbers))

Sum of everything

print(sum(numbers))

Count number 9s

print(numbers.count(9))

Total number of elements

print(len(numbers))