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Code Keys/PySpark Academy/Module 19/Lesson 147
PYSPARK • LESSON 147

Explicit Return Types with Lambda UDFs

How do we define an inline lambda UDF with explicit DoubleType return type for tax calculations?

Expert⏱ 2 Minutes⭐ 770 XP
🤔 THE QUESTION

How do we define an inline lambda UDF with explicit DoubleType return type for tax calculations?

💡 WHAT IS IT?

udf(lambda, returnType) creates a callable Column UDF from an inline Python lambda function.

🎯 WHAT IS IT USED FOR?

Quick custom numerical computations, non-linear scoring, and custom rate calculators.

💻 EXAMPLE
from pyspark.sql.functions import udf
from pyspark.sql.types import DoubleType

calculate_tax_udf = udf(lambda amount, rate: float(amount * rate), DoubleType())

🎯 Mission Objectives

Practice typing production-grade PySpark code for Explicit Return Types with Lambda UDFs.

  • ✓ Import udf and DoubleType
  • ✓ Define multi-argument lambda UDF
  • ✓ Specify explicit DoubleType return contract
🚀 Start Mission
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