Optimizing Python Data Transformations

MediumPython

Problem

Write an optimized function to handle large-scale data transformation in Python.

Implement transform_records(records, mapping) to return a list of transformed dictionaries. records is a list of dictionaries, and mapping maps each output key to a source key. Preserve record order, include only source fields that exist, and return an empty dictionary when no mapped source fields exist.

Constraints

0 <= len(records) <= 5,000
records is a list of dictionaries
mapping is a dictionary from output field names to source field names
Each key and value is a string or JSON-compatible primitive

Function Signature

def transform_records(records, mapping):

CodePython 3

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