Getting Remote Data Lab

Learning Goals

Practice sending GET requests using Python.
Build a reusable class for sending requests and handling responses.

Key Vocab

Request: an attempt by one machine to contact another over the internet.
Client: an application or machine that accesses services being provided by a server through the internet.
Web Server: a combination of software and hardware that uses Hypertext Transfer Protocol (HTTP) and other protocols to respond to requests made over the internet.

Introduction

It is time to practice building out your own class for retrieving remote data. In this lab, you are tasked with building a generic GetRequester class. This class will be able to take in a URL on initialization and send an HTTP GET request on command. You will also need to build a method for dealing with requests that return JSON.

When complete, you will have a simple, but versatile class for getting information from all kinds of sources over the internet.

Instructions

All work should be completed in lib/get_requester.py. Use the previous code-along on getting data from APIs as a reference when building out your class.

Start by creating a GetRequester class. This class should be able to initialize with a string URL.

The GetRequester class should have a get_response_body method that sends a GET request to the URL passed in on initialization. This method should return the body of the response.

The GetRequester class should have a load_json method that should use get_response_body to send a request, then return a Python list or dictionary made up of data converted from the response of that request.

The tests in this lab will use your code to send a request for some JSON data, located at https://learn-co-curriculum.github.io/json-site-example/endpoints/people.json. Read the test error messages for additional as you work for additional information. Don't forget to import the necessary Python modules and classes!

This is a test-driven lab. Run pipenv install to create your virtual environment and pipenv shell to enter the virtual environment. Then run pytest -x to run your tests. Use these instructions and pytest's error messages to complete your work in the lib/ folder.

Once all of your tests are passing, commit and push your work using git to submit.

Conclusion

Once you've successfully passed the tests, from this lesson's directory, you should be able to open repl, use lib/get_requester.py, and send out some requests!

get_requester = GetRequester('https://learn-co-curriculum.github.io/json-site-example/endpoints/people.json')
get_requester.load_json()
#=> [{"name"=>"Daniel", "occupation"=>"LG Fridge Salesman"}, {"name"=>"Joe", "occupation"=>"WiFi Fixer"}, {"name"=>"Avi", "occupation"=>"DJ"}, {"name"=>"Howard", "occupation"=>"Mountain Legend"}]

This class won't work for all cases but is a good starting place to get us off the ground. We can now augment our applications with data from the internet! Combined with our knowledge of Python, we have all the tools we need to start building smarter Python applications populated with real data.