🐍 Python Practice Arena

Sharpening logic. Cracking interviews. One problem at a time.

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"First, solve the problem. Then, write the code." — John Johnson

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🧭 What Is This?

This repository is my personal Python problem-solving journal — a dedicated space where I practice programming challenges to strengthen logical thinking and prepare for technical interviews. Every file here is a step forward in becoming a sharper, more confident developer.

Whether it's a pattern puzzle, a recursion riddle, or a classic interview brainteaser — it lives here, broken down and solved with clarity.

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🎯 Goals of This Repo

• 🧠 Build strong programming logic from the ground up
• 💼 Prepare for technical interviews at top product companies
• 📈 Track consistent progress over time
• 🔄 Revisit and optimize solutions as skills grow
• 📖 Write clean, readable code with comments for learning

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🗂️ Repository Structure

│
├── 📂 01_Logic_Building
│   ├── Numbers
│   ├── Strings
│   ├── Lists
│   ├── Dictionaries
│   ├── List_Comprehension
│   └── Basic_Problems
│
├── 📂 02_DSA
│   ├── Arrays
│   │   ├── Traversal
│   │   ├── Two_Pointers
│   │   ├── Hashing
│   │   ├── Sorting
│   │   └── Prefix_Sum (later)
│   │
│   ├── Strings
│   │   ├── Hashing
│   │   ├── Two_Pointers
│   │   └── Sliding_Window (later)
│   │
│   ├── HashMap_Set
│   ├── Math
│   └── Patterns
│
└── README.md

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📚 Topics Covered

#	Category	Description	Status
01	🔤 Basics	Syntax, loops, conditionals, I/O	✅ In Progress
02	🔡 Strings	Manipulation, formatting, pattern matching	✅ In Progress
03	📋 Lists & Arrays	Iteration, slicing, searching	✅ In Progress
04	🔁 Recursion	Base cases, recursive breakdown	✅ In Progress
05	🗃️ Dicts & Sets	Hashing, lookup optimization	🔄 Upcoming
06	🏛️ OOP	Classes, inheritance, encapsulation	🔄 Upcoming
07	⚙️ Sorting & Searching	Bubble, merge, binary search	🔄 Upcoming
08	🌟 Patterns	Logic-based print patterns	✅ In Progress
09	🔢 Math & Logic	Number theory, mathematical problems	🔄 Upcoming
10	💼 Interview Questions	Classic and FAANG-style problems	🔄 Upcoming

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▶️ How to Run

Clone the repository:

git clone https://github.com/MandarK07/Python-Logic-Building.git
cd Python-Logic-Building

Run any problem file:

python 01_basics/hello_patterns.py

Requirements:

# No external dependencies needed — pure Python 3.x
python --version  # Ensure Python 3.6+

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💡 Problem Format

Each solution file follows a consistent, clean structure:

# ============================================================
# Problem   : Find the Second Largest Number in a List
# Category  : Lists & Arrays
# Difficulty: Medium
# Date      : YYYY-MM-DD
# ============================================================

# 🔍 Approach:
# Iterate through the list, tracking the largest and second largest.

def second_largest(nums):
    first = second = float('-inf')
    for num in nums:
        if num > first:
            second = first
            first = num
        elif num > second and num != first:
            second = num
    return second if second != float('-inf') else None

# 🧪 Test Cases
print(second_largest([10, 5, 8, 20, 3]))   # Output: 10
print(second_largest([5, 5, 5]))            # Output: None

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🚀 Progress Tracker

Total Problems Solved : ██░░░░░░░░  Growing...
Strings               : ████░░░░░░  In Progress
Arrays & Lists        : ████░░░░░░  In Progress
Patterns              : ██████░░░░  Good Progress
Recursion             : ███░░░░░░░  In Progress
Interview Questions   : █░░░░░░░░░  Just Started

Updated regularly as new problems are added!

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🔥 Featured Problems

Problem	Category	Difficulty
Two Sum	Arrays	🟢 Easy
Palindrome Check	Strings	🟢 Easy
Fibonacci (Recursive + Iterative)	Recursion	🟡 Medium
Find All Duplicates	Arrays	🟡 Medium
Balanced Parentheses	Stack / Logic	🟡 Medium
Anagram Groups	Strings / Hashing	🟡 Medium
Binary Search	Searching	🟢 Easy
Merge Sort	Sorting	🔴 Hard

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🧠 Why Python?

reasons = {
    "Readable Syntax"    : "Focus on logic, not syntax noise",
    "Interview Friendly" : "Used widely in coding rounds",
    "Rich Ecosystem"     : "Great for DSA and scripting both",
    "Fast Prototyping"   : "Solve and iterate quickly",
}

for reason, value in reasons.items():
    print(f"✅ {reason}: {value}")

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📌 Learning Resources I Follow

• 📘 Python Docs — Official documentation
• 💻 LeetCode — Interview problem bank
• 🧩 HackerRank — Python challenges
• 📺 CS Dojo — Beginner-friendly DSA
• 📗 Cracking the Coding Interview — Book by Gayle Laakmann McDowell

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🤝 Contributing

This is a personal learning repository, but suggestions are always welcome!

If you spot a bug, have a better approach, or want to suggest a new problem:

1. Fork the repo
2. Create a new branch: git checkout -b suggest/better-solution
3. Commit your changes: git commit -m "Add optimized approach for XYZ"
4. Open a Pull Request 🎉

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📬 Connect With Me

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⭐ If this repo inspires you, give it a star! ⭐

"The journey of a thousand lines of code begins with a single print('Hello, World!')"