Day 20: Advanced Pandas – How Real Data Scientists Work with Data | 120-Day Series

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Welcome to Day 20 of the 120-Day Data Science Series! 🎯
In this video, we go beyond the basics and dive into Advanced Pandas concepts that are used daily by Data Scientists, Data Analysts, and Machine Learning Engineers.

If you want to work confidently with real-world, messy datasets, this video is mandatory.

🔥 What You Will Learn in Day 20
✅ Advanced Data Handling

Index management using set_index() and reset_index()

Efficient data alignment

✅ Advanced Missing Value Handling

Forward fill & backward fill (ffill, bfill)

Practical strategies for real datasets

✅ Data Transformation

Difference between apply, map, and applymap

Writing custom transformation logic

✅ Advanced GroupBy Operations

Multi-level grouping

Aggregations for feature engineering

✅ Merging & Joining DataFrames

Inner join, left join, and real-world use cases

Combining data from multiple sources

✅ Concatenation

Appending and stacking datasets

✅ Time Series Basics

Working with date and time data

Extracting year, month, and time features

✅ Data Reshaping

Pivot tables

Melt (wide-to-long format)

✅ Data Quality & Performance

Identifying and removing duplicates

Efficient filtering using query()

🔗 Resources & Links

📘 Notebook / Code Files: https://drive.google.com/drive/folder...

▶️ Watch Previous Days (Full Playlist)

📌 Day 1 – VS Code Installation
📌 Day 2 – Python Basics [   • How to Install VS Code for Python (Step-by...  ]
📌 Day 3 – Data Structures + Libraries [    • Day 2: Python Basics for Data Science (Beg...   ]
📌 Day 4 – If–Elif–Else Conditions [    • Day 3: Python Data Structures, NumPy & Pan...   ]
📌 Day 5 – For Loop [    • Day 4: Python If–Elif–Else Explained for D...   ]
📌 Day 6 – For Loop Advance [    • Day 6 : Python For Loop SECRET You Need to...   ]
📌 Day 7 – Full While Loop Masterclass [    • Day 7: While Loop Mastery for Data Science...   ]
📌 Day 8 – Functions
📌 Day 9 – List Basics
📌 Day 10 – Advanced Lists
📌 Day 11 – Tuples
📌 Day 12 – Dictionaries (Basics)
📌 Day 13 – Advanced Dictionaries
📌 Day 14 – Python Sets
📌 Day 17 – NumPy Basics
📌 Day 18 – Advanced NumPy


🎥 Full Playlist: [    • 120 Day Data Science Series   ]

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