Python Programming: An Introduction to Computer Science, 3rd Ed.
Python Programming: An Introduction to Computer Science, 3rd Ed.
3rd Edition
ISBN: 9781590282755
Author: John Zelle
Publisher: Franklin, Beedle & Associates
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Chapter 6, Problem 1D

Explanation of Solution

The two motivations for defining functions in your programs are: 

  • Reusability
  • Abstraction

The first motivation is reusability:

  • Once defined, a function can be used over and over and over again.
  • User can save your work by invoking the same function many times in the program.
  • Another aspect of reusability is that a single function can be used in several different and separate programs.
  • When a user needs to write a new program, user can go back to your old programs, find the functions he/she needs, and reuse those functions in his/her new program.
  • User can also reuse functions that somebody else has written...

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