Learn Python the Hard Way: A Deceptively Simple Introduction to the Terrifyingly Beautiful World of Computers and Data Science, 5th Edition

Exercise 21

Functions Can Return Something

You have been using the = character to name variables and set them to numbers or strings. We’re now going to blow your mind again by showing you how to use = and a new Python word return to set variables to be a value from a function. There will be one thing to pay close attention to, but first type this in:

Listing 21.1: ex21.py

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 1   def add(a, b):
 2       print(f"ADDING {a} + {b}")
 3       return a + b
 4
 5   def subtract(a, b):
 6       print(f"SUBTRACTING {a} − {b}")
 7       return a - b
 8
 9   def multiply(a, b):
10       print(f"MULTIPLYING {a} * {b}")
11       return a * b
12
13   def divide(a, b):
14       print(f"DIVIDING {a} / {b}")
15       return a / b
16
17
18   print("Let's do some math with just functions!") 19 20 ...