Functions perform actions from "summary" of Python Programming by John M. Zelle
In Python, functions are used to perform actions. These actions can be anything from simple arithmetic calculations to complex data manipulations. When you define a function in Python, you are essentially creating a reusable block of code that can be called anywhere in your program. Functions are a powerful tool in programming because they allow you to break down your code into smaller, more manageable pieces. This makes your code easier to read, understand, and maintain. Instead of having a long, convoluted program with all the code in one place, you can organize your code into logical units that each perform a specific task. To define a function in Python, you use the `def` keyword followed by the function name and a set of parentheses. Inside the parentheses, you can specify any parameters that the function will take as input. These parameters are like placeholders that you can use within the function to perform calculations or manipulations. Once you have defined a function, you can call it anywhere in your program by using the function name followed by a set of parentheses. If the function takes any parameters, you must provide values for those parameters within the parentheses. When you call a function, Python will execute the code inside the function and return any results that the function produces. Functions can also return values to the calling code. This allows you to pass data back to the calling code for further processing. By using functions to perform actions and return results, you can create modular, reusable code that is more efficient and easier to work with. In summary, functions in Python are essential for performing actions in your program. They allow you to break down your code into smaller, more manageable pieces, making your code easier to read and maintain. By defining functions with parameters and return values, you can create modular, reusable code that is both efficient and flexible.
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