Data Visualization with Python and JavaScript: Scrape, by Kyran Dale

By Kyran Dale

Python and Javascript are definitely the right supplement for turning info into wealthy, interactive internet visualizations, in an international that more and more expects greater than a pre-rendered, static photograph. builders want to know the way to flip uncooked, unprocessed information, usually "dirty" or malformed, into dynamic, interactive internet visualizations. writer Kyran Dale teaches you the way to leverage the facility of best-of-breed Python and Javascript libraries to take action, utilizing attractive examples and stressing well-merited best-practice.

You’ll find out how to:

  • Get info programmatically, utilizing scraping instruments or internet APIs
  • Clean and technique facts utilizing Python’s heavyweight data-processing libraries
  • Deliver facts to a browser utilizing a light-weight Python server (Flask)
  • Receive information and use it to create an internet visualization, utilizing D3, Canvas, or WebGL

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Additional info for Data Visualization with Python and JavaScript: Scrape, Clean, Explore & Transform Your Data

Example text

Using curly-brackets to demark code-blocks, the two doubler functions in this code being equivalent: 10 this is actually done by JavaScript compressors to reduce the filesize of downloaded web-pages 11 The soft vs hard tab debate generates controversy, with much heat and little light. PEP 8 stipulates spaces, which is good enough for me. 12 It could be two or even three spaces but this number must be consistent throughout the module. 46 | Chapter 2: A Language Learning Bridge Between Python and JavaScript var doubler = function(x){ return x * 2; } var doubler=function(x){return x*2;} Much is made of Python’s whitespace but most good coders I know set their editors up to enforce indented code-blocks and a consistent look and feel.

42 | Chapter 2: A Language Learning Bridge Between Python and JavaScript some form, so let’s start with getting output from Python and Java‐ Script. ') You can use Python 3’s print function in Python 2 by importing it from the future module: from __future__ import print_function If you’re not using Python 3 then this is a sensible approach. The new print function is here to stay and it’s best to get used to it now. ); Simple data-processing A good way to get an overview of the language differences is to see the same function written in both.

But this is a keyword that refers to the object calling the method. This calling object can be different from the method’s object instance and Javascript provides the call, bind and apply function methods to allow you to exploit this fact. call(harpo); Out: "Citizen Harpo M. from Freedonia" So JavaScript’s this is a much more malleable proxy than Python’s self, offering more freedom but also the responsibility of tracking calling context and, should you use it, making sure new is always used in creating objects25.

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