Neura Market
Back to .md Directory
RETRIEVAL.md

Lesson 4: Information Retrieval

Guides building a Flask app that fetches Bitcoin exchange rates from multiple APIs, stores them in SQLite, and displays best rates and historical trends.

realpython
May 2, 2026
0 downloads
2 views
ai eval
View source

What this file does

Guides building a Flask app that fetches Bitcoin exchange rates from multiple APIs, stores them in SQLite, and displays best rates and historical trends.

When to use it

  • Learning to pull data from external APIs in a Flask app
  • Building a dashboard that compares live data from multiple sources
  • Practicing scheduled data collection with a scheduler in Python
  • Teaching a workshop on web development for data scientists

Assumes this stack

FlaskSQLiteAJAXPythonHeroku

Lesson 4: Information Retrieval

In this session, you will learn how to obtain data from web APIs as well as parse and normalize the data to use in a chart.

Objectives

By the end of this lesson, you should be able to:

  1. Make an AJAX request from the server to grab data from an external API
  2. Use a scheduler to continuously pull data from external sources

Welcome

Slides: npm run day4

Challenge

The focus over the next two sessions will be to build the following app...

Flask Bitcoin

Build an app that will find the best exchange rates for Bitcoin (USD -> Bitcoin) from the following cryptocurrency exchanges:

  1. Bitstamp
  2. Kraken
  3. Bittrex

It should have the following pages:

  1. The first page should display the rates and highlight the best one
  2. The second page should display the rates over time

Instructions

We'll work through the pseudocode together. You'll code the app either alone (or with the awesome, good-looking people at your table). We'll come together after each step to review.

Part 1 - Server

Code Along!

  1. Project Setup
  2. Add SQLite
  3. Get Data
  4. Add scheduler

Example code: https://github.com/realpython/flask-bitcoin-example

Homework

  1. Compare your code from class with the flask-bitcoin-example code. Make any necessary changes to your code.
  2. Refactor to use SQLAlchemy
  3. Deploy to Heroku
  4. Add the remaining bitcoin exchanges

What's inside

Objectives, challenge description, 4-part build instructions, homework tasks, and links to example code and bonus materials.

Change this for your project

  • Replace realpython/flask-bitcoin-example with your own repository URL
  • Replace exchange URLs https://www.bitstamp.net/, https://www.kraken.com/, https://bittrex.com/ with your data sources
  • Replace npm run day4 with your own slide presentation command

Where it goes

Keep it in your repository where the agent or team that needs it will read it.

Related Documents

RETRIEVAL.md

Data Retrieval

Downloads UK electricity generation and pricing data from Electric Insights and Energy Charts APIs using the moepy library, then visualises fuel-mix time-series.

airageval
0
2
AyrtonB
RETRIEVAL.md

RETRIEVAL.md — Memory Scan Protocol

Defines a five-step internal memory retrieval protocol that surfaces results only in LiveHud gauges, never as visible logs.

aillmeval
0
1
mattvideoproductions
RETRIEVAL.md

Retrieval

Fits linear and nonlinear ephemerides to exoplanet transit times using nested sampling, then compares Bayesian evidence to detect hidden planets.

ai
0
1
pearsonkyle