🚀 21 Days of Python Projects (Beginner → Intermediate)

A curated collection of 21 Python projects built consistently over 21 days.
Each project focuses on real-world problem solving, clean code, and practical concepts.

This repository demonstrates my progression from Python fundamentals to intermediate-level applications involving file handling, APIs, data persistence, automation, and security concepts.

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🧠 What This Repository Demonstrates

• Strong Python fundamentals (loops, functions, conditionals)
• File handling (JSON, CSV, text, binary files)
• API integration (REST APIs)
• Error handling & debugging
• Clean project structure & documentation
• Git & GitHub workflow consistency
• Real-world CLI application design

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📂 Project Index

🔹 Week 1: Fundamentals

Day	Project	Key Concepts
01	Number Guessing Game	loops, random, input validation
02	Calculator	functions, exceptions
03	Password Generator	strings, randomness
04	To-Do List	JSON, persistence
05	Word Counter	dictionaries, text processing
06	Countdown Timer	time, control flow
07	Rock Paper Scissors	game logic, statistics

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🔹 Week 2: Data Handling & APIs

Day	Project	Key Concepts
08	Contact Book	CSV, CRUD
09	Expense Tracker	dates, filtering, aggregation
10	Quiz Game	JSON, scoring, timing
11	Currency Converter	REST API, JSON
12	Weather App	API keys, error handling
13	File Organizer	os, shutil
14	BMI Calculator	math, JSON history

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🔹 Week 3: Intermediate Projects

Day	Project	Key Concepts
15	Web Scraper	BeautifulSoup, HTML parsing
16	Markdown → HTML Converter	regex, parsing
17	Pomodoro Timer	time tracking, stats
18	GitHub Profile Fetcher	GitHub API
19	Password Strength Checker	regex, security
20	Habit Tracker	streak logic, calendars
21	PDF Tool	binary files, PDF manipulation

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🛠 Technologies & Libraries Used

• Language: Python
• Standard Libraries: os, json, csv, datetime, time, re, shutil
• Third-Party Libraries:
  • requests
  • beautifulsoup4
  • pypdf

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📌 Project Standards Followed

For every project:

• Clean folder structure
• README with:
  • Description
  • Features
  • How to run
  • Learnings
• Meaningful Git commit messages
• Commented code explaining logic
• No blind tutorial copy-paste

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▶️ How to Run Any Project

git clone https://github.com/samruddhi796/21-Days-Python-Projects.git
cd 21-Days-Python-Projects
cd DayXX-Project-Name
python filename.py