Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

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Presentation transcript:

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Chapter 5 Functions

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Overview

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Function Declaration

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Parameters

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Parameters

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Positional Arguments

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Keyword Arguments

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Default Arguments

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Return Values

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Return Values If a return statement omits a return value, None is returned implicitly. Likewise, if a function reaches the end of its evaluation without reaching a return statement, the function also returns None.

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Docstrings

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Docstrings

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Docstring Conventions As a matter of consistency always use triple quotes for docstrings even if it is a one line string, The docstring summary should begin with an action verb (e.g., “Return this..”, “Do that..”) The docstring summary should end with a period. For multi-line documentation, the docstring should begin with a one line summary, then one blank line, and then the longer documentation.

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Scope Python has three different kinds of scope: 1.the built-in scope, which is made up identifiers defined by Python, 2.the global scope, which is made up identifiers defined in a Python file but not within a function, and 3.the function scope, which is made up identifiers (including parameters) defined in a function. Consider this simple example where these three different scopes are being used:

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Scope A visualization of the three principle scopes in Python - built-in identifiers form the outermost scope followed by global identifiers and function identifiers.

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Scope

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Scope In this example the function scope has a variable x which shadows the global scope. The result is two different variables that happen to have the same name.

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Scope

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Code Repetition

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Code Repetition

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Code Repetition

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Code Repetition

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Top-Down Design

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Top-Down Design

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Top-Down Design

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Top-Down Design

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Top-Down Design 1.If we break the problem up into smaller parts, we clarify the tasks that need to be done to solve the problem. 2.Each smaller part is typically less complicated than the whole, making the problem more approachable. 3.Smaller parts may be reusable, reducing the implementation size. 4.Breaking the problem up also allows us to distribute the problem solving work, enabling team work.

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Recursion

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Recursion

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Functions as Values

Copyright © 2014 Dr. James D. Palmer; This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. Functions as Values