jirvingphd/code-reviews-week-1-python-basics

Code Review Activity: Python Basics - Loops and Dictionaries

• Reviewing some Python Basics from the Pre-Bootcamp work

Concepts Reviewed/Practiced:

• Creating Lists and Dictionaries
• Conditionals (If/else)
• Creating a Nested Dictionary
• For loops
  • Looping through dictionaries
• Bonus: Object-Oriented-Programming

Instructor/TA Data

• Use the table below to reference the different favorite items for each instructor/TA.

Name	Favorite Color	Favorite Candy	Role
James	Purple	Jelly Bellies	Instructor
Purvi	Red	Milky Way bars	TA
Adam	Blue	Snickers	TA
Josh	Green	Skittles	Instructor

Reviewing Datatypes

Lists

## make a list of all everyones name from the table

Slicing / List Indexing

## slice out the first name from names (what index # is first item?)

## slice out the last name from names (what index # is last item?)

## slice out the first TWO names from names

Looping through Lists

• For each person, print "Hello world, my name is <their name>"

## for each name, print Hello, my name is <name>

Nested Lists (lists within lists)

• Now, let's make a list of all attendee's names and favorite their favorite color.
  • Each item in the list will also be a list that contains ['Name','Fav Color']
  • This will be a nested list

## make a list of all attendee's names and favorite color 
## Each attendee will become a list of 2 things, name and color

# What does the first item in our list look like now?

## What is the last person in the lists favorite color?

• Now loop through our nested list and print the following for each person: - "Hello, world! My name is <name> and my favorite color is <color>."

## Loop through names list again,
# but slice out the correct index for [name, color] for your string

• But what if we had a massive list and we wanted to look up a specific person's favorite color? - Dictionaries to the rescue!

Dictionaries

Instead of a nested list, let's create a dictionary with the person's name as the key and their fav color as the value.

## Instead of a nested list, let's create a dictionary called fav_colors
# with the person's name as the key and their fav color as the value.

# what is James's favorite color?

• Now loop through our dictionary and print the same message as our nested list.: - "Hello, world! My name is <name> and my favorite color is <color>."

## Loop through our fav_colors dict and print the above statement

Nested Dictionaries

• What if we wanted to keep track of multiple pieces of information for each person? - We want to keep track of each persons: - favorite color - favorite candy

• Instead of a nested list, let's create a dictionary with each person's name as the first/outer key.

• For each person's, the value stored in the outer dictonary will no longer be a string: it will be another dictionary!!

  • Each name will now have a dictionary as its value, and the dictionary will contain "color" and "candy"

## make a dictionary of fav_items with the names as the key and a dictionary of {color:red,candy:jelly bellies}

## What does the value for James look like now?

## what is James's fav candy?

## what is Adam's fav color?

## now loop through nested dictionary and print
## my name is ___, my favorite color is ___, and my favorite candy is __

Updating Dictionaries

## james decided he hates purple. His new fav color is Blue. Update the dictioanry to reflect this

## confirm that james' fav color is now Blue

Loops with Conditionals (if/else)

• Next, we want to print two different messages, depending on if the candy is chocolatey or fruity.

• First, we will need a way to look up if a candy is chocolately or fruity

  • We already have two lists for us below.

• Second, we will loop trough our list of names and use if/else to print:

  • If their candy is chocolatey:

    • "My name is<name> and I love chocolatey candy."

  • If their candy is fruity:

    • "My name is <name> and I love fruity candy."

  • If their candy is in neither list:

    • "My name is <name> and I like exotic candy."

## LEAVE THESE LISTS AS THEY ARE!
chocolate_list = ['Snickers','Milky War bars',"M&M's","Hershey's Bar"]
fruity_list= ['Jelly Bellies','Skittles','Starbursts','Gummy Worms']

## Loop through our dict of fav_items

    ## If the person's fav candy choclate:


    ## if the person's fav candy is fruity


    ## otherwise, the persons candy is exotic.

BONUS: Object-Oriented-Programming

• Our fav_items dictionary above is a perfect candidate for creating a class.

• Our Person class will:

  • have a name
  • have a fav color
  • have a fav candy
  • will have a method called .hello() that will print out: "👋Hello, world! My name is ___, my favorite color is ____, and my favorite candy is ___

# now, create a new list called people_list 

# loop through our fav_dict and create a new Person for each person in fav_dict


    ## Maken sure to save the person to your people_list

## take a look at People list to confirm there are 4 people

## Loop through our list of people and run the .hello method