fimoringa/python-p3-badges-and-schedules-lab

Badges and Schedules Lab

Learning Goals

• Practice iterating through lists
• Practice using list comprehension

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Key Vocab

• Interpreter: a program that executes other programs. Python programs require the Python interpreter to be installed on your computer so that they can be run.
• Python Shell: an interactive interpreter that can be accessed from the command line.
• Data Type: a specific kind of data. The Python interpreter uses these types to determine which actions can be performed on different data items.
• Exception: a type of error that can be predicted and handled without causing a program to crash.
• Code Block: a collection of code that is interpreted together. Python groups code blocks by indentation level.
• Function: a named code block that performs a sequence of actions when it is called.
• Scope: the area in your program where a specific variable can be called.

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Instructions

This is a test-driven lab. Run pipenv install to create your virtual environment and pipenv shell to enter the virtual environment. Then run pytest -x to run your tests. Use these instructions and pytest's error messages to complete your work in the lib/ folder.

In this lab you'll be learning how to iterate over the elements in a list and output the results in different ways.

Note: some of the functions for this lab can be written using either a for loop or list comprehension. We recommend that for those functions, you start by coding the solution using a for loop then, once you have the tests passing, refactor your code to use list comprehension. This will give you practice with two techniques you'll use frequently as a Python developer. Furthermore, list comprehension can take a little time to get comfortable with. If you make sure you fully understand the logic of what the function needs to do by writing the for loop version first, it will be easier for you to get it working with list comprehension.

badge_maker()

You're hosting a conference and need to print badges for the speakers. Each badge should read: "Hello, my name is _____." Write a badge_maker() function that, when provided a person's name, will create and return the message, e.g.:

badge_maker("Arel")
# => "Hello, my name is Arel."

batch_badge_creator()

Once the list of speakers for your conference has been finalized, you'll want to get the badges printed for all of your speakers.

Write a batch_badge_creator() function that takes a list of names as an argument and returns a list of badge messages.

batch_badge_creator(["Arel", "Carol"])
# => ["Hello, my name is Arel.", "Hello, my name is Carol."]

assign_rooms()

You just realized that you also need to give each speaker a room assignment. Write a function called assign_rooms() that takes the list of speakers and assigns each speaker to a room. Make sure that each room only has one speaker.

You have rooms 1-7.

Return a new list of strings representing room assignments in the form of: "Hello, _____! You'll be assigned to room _____!"

assign_rooms(["Arel", "Carol"])
# => ["Hello, Arel! You'll be assigned to room 1!", "Hello, Carol! You'll be assigned to room 2!"]

Hint: Think about how you will assign a room number to each person. List items are indexed, meaning that you can access each element by its index number. This tutorial provides several approaches you might use to access the index of each item in the list so you can use it in your message.

Hint: Be sure to return a new list that contains the messages and leave the original list as is.

printer()

Now you have to tell the printer what to print. Create a function called printer() that will output first the results of the batch_badge_creator() function, and then the output of the assign_rooms() function, to the screen.

printer(["Arel", "Carol"])
# Hello, my name is Arel.
# Hello, my name is Carol.
# Hello, Arel! You'll be assigned to room 1!
# Hello, Carol! You'll be assigned to room 2!

Hint: remember you can call one function from inside another function. If the return value of assign_rooms() is a list of room assignments, how can you print out each assignment? You'll need to iterate over your list of room assignments in order to print out each individual assignment.

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Resources

• 5. Data Structures - Python
• Python For Loops - W3schools
• Python List Comprehension - W3schools