Week 8 intro to python

Speaking in Code

Intro to Python

Brian Lee

Professor Liel Leibovitz

Speaking in Code

Logistics: Projects
• As open-ended as you want
• Due Date: Some time reasonable – end of semester
• Some ideas:
– Choose your own adventure
– Blog, Personal Site
• Requirements:
– Decent amount of code
– Please include comments

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JavaScript

• Barely scratched the surface of JavaScript

• Resources:
– http://www.codecademy.com/tracks/javascript

– Any O’Reilly Books
• http://bit.ly/good-parts

• http://bit.ly/js-web-apps

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Brief Intro: jQuery

• jQuery is not a language
jQuery === JavaScript

• jQuery is a JavaScript library
– A prepackaged, reusable set of functions and tools

• Makes it easier to manipulate webpages

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Brief Intro: jQuery

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Brief Intro: jQuery

<p>Just a normal p tag here</p>

$(“p”).addClass(“highlight”)

<p class=“highlight”>Just a normal p tag here</p>

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Brief Intro: jQuery

• Resources:
– http://learn.jquery.com/

– http://www.codecademy.com/tracks/jquery

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On to the Next!
• That’s it for web technologies!

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Back to the Backend

• Frontend
– Browsers

– User directly interacts and sees this

• Backend
– Server-side

– Examples: validation -> creating user accounts

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Conceptualizing the Backend

• Server handles the server-side languages
– Ruby

– Python

– PHP

– etc.

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Why do we need server-side language?

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Why do we need server-side language?
1. Browser: Give me this webpage! (typing in url)
2. Server: Okay, got your message!
3. Server: Runs server-side script that analyzes data
– Who is this user? What does this user have access to?

4. Server: Dynamically creates HTML file to send
5. Browser: Receives HTML file (which includes HTML,
CSS, JavaScript, etc)

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What do servers do?

• Processes data before it shows on the browser

• Central location to store data

• Server-side scripts process and analyze the data
– Data manipulation

• Servers are essentially very powerful computers

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Sever-side Scripts vs JavaScript

• Cannot see the server side source code

• Inspect Element shows you all “resources” that live in
the client-side
– HTML, CSS, JavaScript

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Intro to Python

• Programming language that is widely used

• LOTS of companies use it:
– http://b.qr.ae/XvvkWV

• Simpler and more intuitive syntax (more like English)

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Intro to Python: Variables

• Same as JavaScript, except simpler syntax

• Python:

name = ‘Brian’

• JavaScript
var name = ‘Brian’;`

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Intro to Python: Data Types

• Remember this in JavaScript?

• Booleans: True or False

• Numbers

• Strings: “hello”, ‘1’

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– Must be Capitalized

• Numbers


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• Numbers
– Integer: 1, 2, -2331, -4

– Floats: 1.0, 12.321321


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• Numbers

– Double or Single quotes

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Intro to Python: Syntax

• No more worrying about JavaScript syntax
–{ }

–;

– var

• Each line is interpreted as a statement

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Intro to Python: Syntax – Whitespace

• Indentation and white space matter!

• Whitespace is same as “;” in JavaScript

number = 12
if number < 5:
print “Dang”
print “Less than 5?”
print “hello”

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Intro to Python: Comments

• Yes comments exist here as well!

• Single line comments:
# Guess there isn’t much to say…

• Multi-line comments: Triple Quotes

‘’’Can exist
in multiple
lines’’’

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Try it out:

http://bit.ly/nyupython

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Easter Egg

• Zen of Python

import this

Week 8 intro to python

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