So before we go further in our study of the Python programming language, we’ll introduce the Function Design Recipe, a structured process for taking a problem description and designing and implementing a function in Python to solve this problem.

You should understand the reasons for each of the components of the design recipe and the particular way that they are expressed. You should start to use the design recipe and appropriate coding style for all Racket programs you write.

The Function Design Recipe places a large emphasis on developing a precise and detailed function header and docstring before writing any code for the function body. There are two main benefits to doing this.

Here are the steps of the design recipe: Let’s go over these one at a time. Python has some built-in forms of data: integers, floating-point numbers, strings, booleans, et cetera. Python also has compound data: objects, dictionaries, lists, and others.

The design recipe is a five- or six-step sequence of steps for designing functions, a.k.a. programs. Data Definition : A data definition describes a set of values in a standardized yet flexible way. It takes the form of a comment, supported by class definitions.

• Examples/Tests: what is a typical call of your function? How can somebody tell whether your function is returning a correct value? • Strategy: how does your function compute the desired value? Describe the way it works in a tweet. • Function Definition: the code of the function. • Program Review: now that you have a working function ...

The How to Design Functions (HtDF) recipe is a design method that enables systematic design of functions. We will use this recipe throughout the term, although we will enhance it as we go to solve more complex problems.

Write one or two examples of calls to your function1 and the expected returned values. Include an example of a standard case (as opposed to a tricky or corner case). Put the examples inside a triple-quoted string that you've indented since it will be the beginning of the docstring.

Write a full design recipe for a function distance which computes the distance between (0;0) and a given point (x;y). Include purpose, contract, examples, implementation, and tests.

The Design Recipe is a structured approach to writing functions that includes writing a purpose statement and test cases to ensure that the function works as expected. Once students have mastered the Design Recipe process, they can apply it to any word problem they encounter.