Block 49: Data Merging from Multiple Sources
Combine data from CSV, JSON, and Excel into one unified DataFrame.
Concepts
- Loading from different formats into DataFrames
- Aligning column names before concatenation
- Deduplication with drop_duplicates()
- Validating merged results
Code Examples
See exercise below.
Exercise
Load the same dataset stored as CSV, JSON, and Excel. Merge all three and verify no duplicates. Write a function load_and_merge(file_list) that handles CSV, JSON, and Excel automatically.
Homework
What real-world problems arise when merging data from multiple sources? List 3 and how to handle them.