Sep 21: Defining Functions, return

Meet in King 248

Learning Objectives

After today's class, you should be able to:

• Describe the syntax of function definitions and function calls.
• Explain the flow of execution from one function to another.
• Write short functions that have parameters and return values.

Lesson Outline

Mini Lecture [15 min]

• Functions have parenthesis
  • Example from algebra: \(f(x) = 2x\)
  • \(f\) is a function, \(x\) is a variable, \(2x\) is the result
• Python keywords: def and return

  def double(number):
      return 2 * number
  

• Examples
  • temperature.py
  • geometry.py

Practice [35 min]

• Ex5.2 Unit Conversions
  • Submit to Gradescope before you leave
  • Submit even if you haven't fully finished

Your To-Do List

• Read the Week 5 guide and begin studying