OpenBrackets

Beginning Programming

Week 6 Day 2

Welcome!

Welcome to class!

This is the Beginning Programming class

• 5 - 6:30pm : 5 min break towards the middle�
• Teachers and TAs are:
• Aidan, Jacob, Kevin, Darach

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• No grades - but the more we can help each other learn as a group, the better

Have a question?

Ask a teacher or TA

Type in chat

Or

1. Click Reactions
2. Click Raise Hand

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Or un-mute and speak up

What is a function?

• Functions are blocks of code that run when you call them
• Often do “tasks”, making them reusable

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Functions:

• are defined with def, (parameters), and a :
• indented code is the code run when the function is called
• functions have arguments/parameters - values you put in
• functions return values back at the end

Will not do anything unless we call the function at the bottom with ()

def printName():

name = "Trisha"

print(name)

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printName()

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Libraries are great ways to get more functions

• Collection of resources someone else made (like a toolbox, or a script)
• You can access them by importing [library]

Example: the random library

• Has something to find a random number between 2 given numbers
• Saves YOU time, you don’t have to write this

Import random * # This imports all the

# stuff from random

print(random.randint(0,10)) # This uses randint from

# the random library

Bear attributes

How do we store properties about a bear? We could use a list with certain positions:

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bear_attributes = [ 'frank', 500, 'insect hive removal specialist' ]

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If we use a list we must:

• be careful to put values in the right order
• comment which value is where so we don't confuse them

Bear attributes

Another way is to use a dictionary :

bear_attributes = { 'name': 'frank', 'weight': 500,

'occupation': 'insect hive removal specialist' }

bear_attributes['occupation']

• Dictionaries use curly braces to define them
• Dictionaries use a string as a key
• You can use a string as a key to get a value

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Dictionaries are like lists, but you use a string to access which value, not an integer

Examples of dictionary

this_dictionary = { 'pocket' : 'lint' }

print(this_dictionary)

this_dictionary['pocket'] = 'compass'

print(this_dictionary)

this_dictionary['belt'] = 'sliderule'

print(this_dictionary)

5 Minute Break!

Giving bear more attributes in the GRID FOREST

Let's modify the GRID FOREST to save all the bear information in a dictionary, with keys like:

• row
• column
• hunger
• tiredness

Modify the game to use these values from the dictionary

Second bear in the forest???

Next, let's add more bears to the forest - copy and paste the code you used to make the first bear, to make the second.

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Let's have this be a PHASE-BEAR :

• a PHASE-BEAR moves to a random position each turn

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Store each of the bear's attribute dictionary in a list of all bears (list of dictionaries)

You can use dictionaries to translate strings to numbers

Dictionaries are particularly useful for turning n e w s�into numbers

• Revist your code for INFINITE DUNGEON
• Instead of using a for loop and counter to determine which exit was selected and where it goes,�use a dictionary where �the key is the direction�and the value is which room it leads to

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You can use a similar trick in GRID FOREST

Simple code is good

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Use functions, dictionaries, lists, and for loops to make your code simple and short

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Short is good�(except - more comments the better)

What games are you planning to make?

When you need help outside class

Email openbracketscoding@gmail.com and say what class and teacher you have

• Don't email teacher directly.

If you are age 13 or older, you can try Discord

• https://discord.gg/ZRtk534

The age restriction is because of Discord’s Terms of Service

Thanks for coming to class!

Please let us know if you have any questions!