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Web Application Development with Streamlit: Introduction and Motivation

A web application is an interactive program using technologies like HTML$,$ CSS$,$ and JavaScript, alongside databases and APIs for CRUD operations $($Create$,$ Read, Update, Delete$).$ This project involves building a Streamlit$-$based web app to showcase usability and Human$-$Computer Interaction $($HCI$)$ principles, with dynamic API$-$driven features such as charts, tables, maps, and widgets.

Objective

Develop a Streamlit web app that:

Adheres to HCI principles like consistency, feedback, and flexibility.

Utilizes APIs to fetch and display data dynamically.

Includes interactive widgets and feedback tools for enhanced usability.

Emphasizes effectiveness, efficiency, learnability, and error prevention.

Requirements

API Integration

Fetch data dynamically using JSON, XML$,$ or CSV formats. Choose a public API related to a theme $($e$.$g$.,$ weather, finance, transport$).$

Core Features

$1$ interactive table. $2$ charts: line, area, or bar $($e$.$g$.,$ st$.$line$\_$chart, st$.$bar$\_$chart$).1$ map with points marked $($st$.$map or st$.$pydeck$\_$chart$).$ Interactive Widgets:

$1$ button, $1$ checkbox, and $5$ others $($e$.$g$.,$ sliders, text inputs, radio buttons$).$

Feedback Mechanisms:

Success, info, warning, or error messages.

HCI Design Principles

Content Organization: Easy$-$to$-$navigate and visually cohesive. Consistency: Predictable interactions across the app. Feedback: Provide immediate responses to user actions. Accessibility: Ensure usability for diverse users.

Testing and Accessibility

Conduct usability tests and refine the design based on feedback. Use guidelines like Web Content Accessibility Guidelines $($WCAG$).$

Development Process

Setup

Install Python $3\mathrm{.}9+$ and required packages:

pip install streamlit pandas numpy matplotlib

Create a new project in PyCharm or similar IDE.

Prototype Design

Sketch layouts with grouped categories. Plan widget placement and user flow.

Implementation

Use Streamlit for:

Data Visualizations: st$.$bar$\_$chart, st$.$line$\_$chart, and maps. Interactive Widgets: Sliders, checkboxes, and text inputs. Feedback: Success and warning messages.

Integrate API calls to fetch real$-$time data.

Testing and Refinement

Conduct usability tests with users. Improve the app based on feedback for better efficiency and satisfaction.

Use Case Ideas

Personal Finance Dashboard

Track expenses and visualize spending trends with API$-$driven data.

Health Tracker

Input daily metrics $($e$.$g$.,$ water intake$)$ and visualize progress.

Public Transport Accessibility App

Offer route details with accessibility information.

Local Event Planner

Map events with RSVP options for community engagement.

Submission Deliverables

Web Application

Submit a zip file containing the source code.

Video Demonstration

Record a $35$ minute video showcasing app features and purpose.

Optional Report

Summarize usability goals, API integration, and testing.

Grading Criteria

Relevance: Alignment of the app topic with API data.

Functionality: Correct use of charts, maps, and widgets.

Usability: Adherence to HCI design principles.

Responsiveness: Effective testing and feedback handling.

Reflection

This project emphasizes collaboration, API usage, and user$-$centered design. It combines technical skills with HCI concepts to create practical, user$-$friendly applications. Future improvements could involve advanced visualizations or AI$-$based features for personalization.

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