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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Introduction to Python | Girl Develop It Class 4</title>
<meta name="description" content="This is the official Girl Develop It Core Intro to Python course. The course is meant to be taught in four two-hour sessions. Each of the slides and practice files are customizable according to the needs of a given class or audience.">
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<script src="lib/js/head.min.js"></script>
<!--[if lt IE 9]>
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<![endif]-->
</head>
<body>
<div class="reveal">
<!-- Any section element inside of this container is displayed as a slide -->
<div class="slides">
<!-- Opening slide -->
<section>
<img src="images/gdi_logo_badge.png" class="img--bare" height="450px" />
<div class="box--small">
<h3><span class="green">Intro to Python Class 4</span></h3>
</div>
</section>
<section>
<h3>Review</h3>
<ul class="box list--xtall copy--small">
<li>Functions</li>
<li>Method calls</li>
<li>Data Type: Dictionaries</li>
</ul>
</section>
<section>
<h3>What we will cover for the rest of today</h3>
<ul class="list--xtall copy--small box">
<li class="fragment">(Even) More Data Types</li>
<li class="fragment">Combining data types</li>
</ul>
</section>
<section>
<h3>Data Type: Sets</h3>
<p class="copy--small">Sets are unordered data types whose elements are unique. Therefore, adding a value to a set that already has it, does nothing.</p>
<p class="copy--small fragment">Sets can be created with comma separated elements enclosed in {} in Python 2.7 or greater.</p>
<p class="copy--small fragment">Very often, one will make a list and use the set() function to eliminate duplicates.</p>
<pre class="fragment"><code class="python">
>>> list_a = [0, 3, 2, 0, 2, 7]
>>> set_a = set(list_a)
>>> print set_a
set([0, 2, 3, 7])
>>> set_b = {1, 2, 1, 3}
>>> print set_b
set([1, 2, 3])
</code></pre>
<p class="copy--small fragment">Sets have an add method, which like append for lists, adds an element to a set.</p>
</section>
<section>
<h3>Data Type: Lists of ... Lists</h3>
<p class="copy--small box--small">As we have already seen, an element in a
list can be other lists.</p>
<p class="copy--small box--small fragment">Lists inside of a list are referred to as <strong>nested</strong></p>
<div class="fragment"><p class="copy--small box--small">The following is a list of lists:</p>
<pre><code contenteditable class="small python">
game_board = [
['O', 'X', ' '],
[' ', 'X', ' '],
[' ', ' ', ' '],
]
</code></pre></div>
<p class="copy--small box--small fragment">This can be indexed successively with <code>game_board[0][1]</code></p>
</section>
<section>
<h3>Nested Lists continued</h3>
<p class="copy--small box--small">A list can be appended to a list as well</p>
<pre><code contenteditable class="small python">
mary_shopping_list = ['apples', 'bananas', 'chicken', 'ice cream']
fran_shopping_list = ['ice cream', 'beef', 'peppers', 'apples']
bob_shopping_list = ['chicken', 'peppers']
family_shopping_list = []
family_shopping_list.append(mary_shopping_list)
family_shopping_list.append(fran_shopping_list)
family_shopping_list.append(bob_shopping_list)
print family_shopping_list
for shop_list in family_shopping_list:
for food_item in shop_list:
print food_item
</code></pre>
<p class="copy--small box--small fragment">What if we want to <strong>flatten</strong> the family shopping list?</p>
<p class="copy--small box--small fragment">What if we want the food items in the family shopping list to be unique?</p>
</section>
<section>
<h3>Lists of Dictionaries</h3>
<p class="copy--small box--small">One of the most common and useful nested data structures,<br/>is a list of dictionaries</p>
<pre><code contenteditable class="python">
card_a = {
'suit': 'spades',
'number': 4,
}
card_b = {
'suit': 'hearts',
'number': 8,
}
hand = [card_a, card_b]
print 'The hand contains:'
for card in hand:
print 'A', card['number'], 'of', card['suit']
</code></pre>
</section>
<section>
<h3>Dictionary of Lists</h3>
<p class="copy--small box--small">A dictionary can also contain values that are themselves<br/>other data types, such as lists.</p>
<div class="fragment"><p class="copy--xsmall box--small">Let's revisit the group of to do lists and find a better representation:</p>
<pre><code contenteditable class="small python">
mary_shopping_list = ['apples', 'bananas', 'chicken', 'ice cream']
fran_shopping_list = ['ice cream', 'beef', 'peppers', 'apples']
bob_shopping_list = ['chicken', 'peppers']
family_shopping_list = {
'mary': mary_shopping_list,
'fran': fran_shopping_list,
'baby': bob_shopping_list,
}
for name, shop_list in family_shopping_list.items():
print name, 'needs to buy: ', shop_list
# Changing this later can be accomplished with
family_shopping_list['fran'].append('strawberries')
</code></pre></div>
<p class="copy--xsmall box--small fragment">Now the to do lists can be indexed or modified by name</p>
</section>
<section>
<h3>Means of Combination</h3>
<p class="copy--small box--small">Lists, dictionaries, and other data types are all<br/>a means of combination.</p>
<p class="copy--small box--small fragment">They can be freely combined to create the<br/>data structure needed for a particular problem.</p>
<div class="fragment"><p class="copy--xsmall box--small">Eg. A list of dictionaries with lists</p>
<pre><code contenteditable class="python">
all_tweets = [
{
'author': 'mary',
'handle': '@hadalittlelamb',
'date': '2013-01-22',
'tweets': [
'at Loco Pops enjoying a Raspberry Sage popsicle',
'Learning Python is so much fun',
],
},
]
</code></pre></div>
</section>
<!-- Block 1 - Intro to Classes and OOP - 20 minutes -->
<section>
<h3>Functions on Dictionaries</h3>
<p></p>
<pre><code contenteditable class=" python">
character = {
'level': 'beginner',
'health': 100,
}
def injure(character, damage):
character['health'] = character['health'] - damage
if character['health'] < 0:
character['health'] = 0
def heal(character, amount):
character['health'] = character['health'] + amount
if character['health'] > 100:
character['health'] = 100
</code></pre>
</section>
</section>
<section>
<h3>Functional Python: Map</h3>
<p class="copy--small box--small">Python is a not a purely functional language, but it can be used (and is commonly used) for functional programming.</p>
<p class="copy--small box--small">There are four functions that are used for functional programming: Range, Filter, Map, and Reduce</p>
<p class="copy--small box--small">One commonly used, higher order function<br/>(that is a Python builtin) is called <strong>map</strong></p>
<pre><code contenteditable class=" python">
# Define any function
def sqaure(number):
return number ** 2
# Pass the function to map along with an iterable
squares = map(square, range(10))
</code></pre>
</section>
<section>
<h3>Let's Develop It</h3>
<p class="box--small copy--small fragment">Write a function that prints the double<br/>of every number from 0 to 10 using a for loop</p>
<p class="box--small copy--small fragment">Write a function that prints the double<br/>of every number from 0 to 10 using a range</p>
<p class="box--small copy--small fragment">Write a function that prints the double<br/>of every number from 0 to 10 using a map</p>
<p class="box--small copy--small fragment">Write a map that takes in a list and appends "or I'll be a monkey's uncle" to every item in that list. (input: [1,4], output: ["1 or I'll be a monkey's uncle"], "2 or I'll be a monkey's uncle"])</p>
</section>
<section>
<h3>Let's Develop It</h3>
<p class="box--small copy--small">Choose among any of these projects:<br/><small>(Resources available on the next page)</small></p>
<ul class="copy--xsmall list--tall">
<li><strong>Search the Web </strong>- Write a program that searches the web<br/>using DuckDuckGo and displays results.
</li>
<li><strong>Encryption </strong>- Write a program that encrypts a string from<br/>user input, or file and is able to decrypt it as well.
</li>
<li><strong>Command Line Game </strong>- Create a simple game that runs inside the terminal.
</li>
</section>
<section>
<h3>Let's Develop It Resources</h3>
<table class="copy--small box">
<tr>
<td style="width: 250px;">Search the Web</td>
<td style="padding-bottom: 20px;"><a href="https://github.com/crazedpsyc/python-duckduckgo/">python-duckduckgo</a> library to get started. Download duckduckgo.py and put it in the same directory as your code. Use the query() function it provides to begin. (HINT: Results are often empty, but 'related' list usually has a few hits.)</td>
</tr>
<tr>
<td>Encryption</td>
<td>Read about the <a href="https://en.wikipedia.org/wiki/Caesar_cipher">Caesar Cipher</a> or find a similarly simple encryption mechanism online. You should find the ord() and chr() functions helpful, as well as the modulus operator '%'</td>
</tr>
</table>
</section>
<section>
<h3>Let's Develop It Resources Continued</h3>
<table class="copy--small box">
<tr>
<td style="width: 250px;">Command Line Game</td>
<td>This might be a text adventure with paragraphs of text followed by a series of choices for the user. A choice maps to another node in the story (another paragraph with choices). You might try storing the paragraphs separately in a text file. The format might be something different, such as a series of "rooms", each with a description, for the user to explore by entering commands such as "go west". Examples of these kinds of games are <a href="https://en.wikipedia.org/wiki/Colossal_Cave_Adventure">Colossal Cave Adventure</a> and <a href="https://en.wikipedia.org/wiki/Zor">Zork</a></td>
</tr>
</table>
</section>
<section>
<h3>Future Resources</h3>
<table class="box copy--xsmall">
<tr>
<td style="width: 30px;"><a href="https://automatetheboringstuff.com/">Automate the Boring Stuff with Python</a></td>
<td style="padding-bottom: 20px;">Online book of 'practical programming for total beginners'.</td>
</tr>
<tr>
<td style="width: 360px;"><a href="http://docs.python.org/2/">Python.org Documentation</a></td>
<td style="padding-bottom: 20px;">Official Python Documentation</td>
</tr>
<tr>
<td><a href="http://www.greenteapress.com/thinkpython/html/index.html">Think Python</a></td>
<td style="padding-bottom: 20px;">Online and print book with exercises.</td>
</tr>
<tr>
<td><a href="http://learnpythonthehardway.org/book/">Learn Python the Hard Way</a></td>
<td style="padding-bottom: 20px;">Online and print book with exercises</td>
</tr>
<tr>
<td><a href="https://developers.google.com/edu/python/">Google's Python Class</a></td>
<td style="padding-bottom: 20px;">Video lectures coupled with exercises</td>
</tr>
<tr>
<td><a href="http://newcoder.io/tutorials/">New Coder</a></td>
<td style="padding-bottom: 20px;">Ideas for slightly larger projects and resources to get you started. Projects include accessing API's, scraping pages, writing IRC bots, and others.</td>
</tr>
<tr>
<td><a href="http://girldevelopit.com/">Girl Develop It</a></td>
<td style="">Local workshops, events, and coding sessions</td>
</tr>
</table>
</section>
<section>
<h3>Survey</h3>
<p class="box--small copy--small fragment">Please fill out this <a href="http://bit.ly/GDI-NYC">survey</a> to let us know how you felt about this class, and if there's any ways we can improve.</p>
</section>
<section>
<h3>Questions?</h3>
</section>
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