![]() ![]() Next is a colon, :, which ends the function's definition line.Inside them, there can be zero, one, or more optional comma separated parameters with their optional default values. Then we have a set of opening and closing parentheses, ().It's important to know that function names can't be a Python reserved keyword. Words are lowercase and separated by underscores. Valid names start with a letter or underscore but can include numbers. Next comes a valid function name of your choosing.def is a keyword that tells Python a new function is being defined.The general syntax for creating a function in Python looks something like this: def function_name(parameters): The code inside a function runs only when they the function is called.įunctions can accept arguments and defaults and may or not return values back to the caller once the code has run. This complies with the DRY (Don't Repeat Yourself) principle in software development. This saves you from having to search for different pieces of the same code that have been scattered in different locations in your program by copying and pasting. If you need to make a change, you'll only need to update that certain function. If a certain action is required often and in different places, that is a good indicator that you can write a function for it. What is a Function?Ī function is an isolated block of code that performs a specific task.įunctions are useful in programming because they eliminate needless and excessive copying and pasting of code throught a program. It will also give you an overview of how to pass input parameters and arguments to your functions. This article will show you how to create and call your own Python functions. ![]() And each one performs a specific task.īut did you know that Python also allows you to define your own functions? Python has a bunch of helpful built-in functions you can use to do all sorts of stuff. ![]()
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