Python Interview Question Part 2| Flatten Nested Dictionary in Python

🔹 Flatten Nested Dictionary in Python | Python Interview Question In this video, we solve a commonly asked **Python coding interview question**: **How do you flatten a nested dictionary in Python?** Nested dictionaries are very common when working with **JSON data, APIs, and hierarchical data structures**. In many real-world scenarios—especially in **data engineering and data processing pipelines**—we need to convert nested structures into a flat format. In this video, you will learn: • How to flatten a nested dictionary in Python • How to combine nested keys using dot notation (`.`) • How to use **recursion** to process nested data structures • How to handle dictionaries with multiple levels of nesting Example Input: ```python input_dict = { "user": { "id": 123, "personal_info": { "name": "Alex", "email": "[email protected]" } }, "status": "active" } ``` Expected Output: ```python { "user.id": 123, "user.personal_info.name": "Alex", "user.personal_info.email": "[email protected]", "status": "active" } ``` This problem is very useful in real-world applications such as: • Processing nested **JSON API responses** • Preparing data for **dataframes or SQL tables** • Transforming hierarchical data structures Subscribe to the channel for more content on: • Python Interview Questions • Data Engineering Concepts • PySpark Interview Preparation • SQL Interview Questions Channel: **Data Engineering with Mahesh** Code for this video: ** https://github.com/mahesh-cr-de/python-coding-interview ** #Python #PythonInterview #CodingInterview #DataEngineering #PythonProgramming #Dictionary