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Coding For Humanists Workshop

Coding For Humanists Workshop. Topics - Today. Morning Introduction and Justification Installing Ruby Small Code Practice Examples Text Processing Afternoon Web scraping Wikipedia Text Parsing. Topics - Tomorrow. Morning Intermediate Ruby Methods Conditionals Loops Afternoon

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Coding For Humanists Workshop

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  1. Coding For Humanists Workshop

  2. Topics - Today • Morning • Introduction and Justification • Installing Ruby • Small Code Practice Examples • Text Processing • Afternoon • Web scraping Wikipedia • Text Parsing

  3. Topics - Tomorrow • Morning • Intermediate Ruby • Methods • Conditionals • Loops • Afternoon • Working with APIs • Twitter • Google Maps API • Google Charts API

  4. Introductions • Who you are • What you hope to learn • What tools you currently use

  5. Digital Humanities • Data Mining • Data Visualization • Text Analysis • Geographic Information Systems • Multimedia

  6. Why Ruby • Open-Source • Community • English-like syntax • Interpreted • Ruby on Rails – for web apps

  7. Shorter Code • C++ • Ruby

  8. Ruby Installation • Windows • rubyinstaller • Mac • Comes pre-installed • railsinstaller

  9. Text Editor • Any text editor will do. • Preferences: • Windows • SciTE • Notpad++ • Mac • Text Wrangler • Sublime Edit

  10. Running Ruby Code • Write code using text editor • Save file as ____________.rb • Open Terminal (Command Prompt) • Type “ruby ____________.rb

  11. IRB • Interactive Ruby • Can run commands directly from terminal • Start by typing “irb” • “exit” to return to terminal

  12. First, some terminal commands • ls / dir • cd • .. • tab (auto complete) • mkdir • rmdir • rm

  13. You knew it was coming… • Hello World. • First in irb • Then as a .rb file

  14. Resources • The Bastard’s Book of Ruby • CodeAcademy • Ruby-lang.org

  15. Writing to a file • open("hello-world.txt", 'w') • Will create a new file relative to the program that runs it.

  16. Reading a web page require "open-uri” puts open("http://en.wikipedia.org/wiki/Ada_Lovelace").read What if you wanted to grab the text of the New York Times home page?

  17. Data Types • Strings • In quotes • Just characters. • Numbers • Integers • Whole numbers with no decimals • 5 • 458 • -7 • Floats • Numbers with decimals • 1.4 • 0.5 • 3.0

  18. Variables • Words or letters that stand in for something else. • Numbers • Strings • Objects • Examples • Arithmetic • String concatenation • Mixed

  19. String Example x = "http://en.wikipedia.org/wiki" y = "Ada_Lovelace" z = x + "/" + y puts x puts y puts z

  20. Another way… require "open-uri" remote_base_url = "http://en.wikipedia.org/wiki" remote_page_name = "Ada_Lovelace" remote_full_url = remote_base_url + "/" + remote_page_name puts open(remote_full_url).read

  21. Another way… require "open-uri" remote_base_url = "http://en.wikipedia.org/wiki" remote_page_name = ”Ruby" remote_full_url = remote_base_url + "/" + remote_page_name puts open(remote_full_url).read

  22. Saving remote files require "open-uri" remote_base_url = "http://en.wikipedia.org/wiki" remote_page_name = "Ada_Lovelace" remote_full_url = remote_base_url + "/" + remote_page_name remote_data = open(remote_full_url).read my_local_file = open("my-downloaded-page.html", "w") my_local_file.write(remote_data) my_local_file.close

  23. Collections and Loops (1..10).each do |a_number| puts a_number end

  24. Strings and Numbers • What a difference quotes make. • “42” is different than 42 • Try arithmatic

  25. Looping remote_base_url = “http://en.wikipedia.org/wiki" (1..3).each do |some_number| r_url = remote_base_url + "/" + some_number.to_s puts r_url end

  26. Exercise • Visit one of the URLs generated from our numerical loop, such as http://en.wikipedia.org/wiki/1. It's the Wikipedia entry for Year 1.

  27. Exercise • Specify two numbers, representing a start and end year • Use that range to create a loop • Retrieve the Wikipedia entry that corresponds to each iteration of the loop • Save that Wikipedia page to a corresponding file on your hard drive • In a second loop, combine all those year entries into one file, with the name of "start_year-end_year.html"

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