Intro to Functions Python
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This document introduces functions and how they can be used to make code more readable and reusable. It provides an example of defining a moveMile function to have a jeroo hop eight times to move one mile, rather than writing out the individual hop instructions. Functions should perform a single well-defined task, be given descriptive names, and can be called to reuse blocks of code. The document demonstrates defining a moveMile function and encourages the reader to create their own mileWalker function to practice this concept.
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- An introduction to variables in Logo using the make command to assign values, and using : before a variable name to evaluate its value.
- Examples of arithmetic operations in Logo like addition, subtraction, and using print to output results.
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Intro to Functions Python
- 2. Think About It!?!? Create an algorithm for the following situation Make a jeroo turn around
- 3. What is a Function? Functions Well Defined Single Tasks Easier to read code Separate Your program Reuse sections of code Name them using camelCase Give good names like variables
- 4. Example Task: Have the jeroo hop five miles (eight blocks = 1 mile). Old way: Silver.hop() Silver.hop() Silver.hop() Silver.hop() Silver.hop() Silver.hop() Silver.hop() Silver.hop() Silver.hop() Silver.hop() etc (should have 40 instructions)
- 5. Example Better way: Define a moveMile instruction as eight move instructions. Then call moveMile 5 times. Both programs move the jeroo the same distance, but the second program will be much easier to read and understand. In complicated programs, the ability to extend a jeroo’s vocabulary makes the difference between understandable programs and unintelligible ones.
- 6. Defining New Functions def functionName(self ): <list-of-instructions> The function name should specify what the method is intended to do. The list of instructions should accomplish what its name implies. Each function should perform only a single task This is a “block” of code
- 7. Defining a MileWalker Jeroo def moveMile(self): self.hop() self.hop() self.hop() self.hop() self.hop() self.hop() self.hop() self.hop() Program in the general
- 8. Exercise Create a mileWalker in your intro exercise Notice how your main is beginning to resemble an algorithm and all the tedious code is hiding in methods Question: Where is a list of all the predefined functions in Jeroo?