Learning how to define a function in Python is one of the most important steps in mastering the language. Functions are blocks of code that perform a specific task and can be “called” from anywhere in the rest of the program. That way, you can avoid writing large amounts of code over and over again, and you can handle dynamic processes that are responsive to context and user interaction.
Let’s take a closer look!
How to define a function in Python
The good news is that Python makes defining functions very easy. This is because Python uses very nice syntax that looks a lot like English. To define a function, we simply use the “def” statement. Can you guess what this is short for?
Then we follow this instruction with the name of our function (usually each word in capital letters) and then with closed brackets. Finally, we’ll use a colon and an indentation.
We then indent each code that should belong to the function. We end with the “return” statement, which tells Python to jump back to where it was in the code.
Here’s how to do this:
def hello_print(): print("Hello world!") return hello_print()
Pass arguments argument
Once you know how to define a function in Python, the next step is to learn how to pass arguments. Arguments are simply variables that you want to pass into your functions in order to manipulate them or transform them in some way.
A simple example would be to pass a string to our function so that we can greet the user by name:
def hello_print(Name): print("Hello" + Name) return hello_print("Barry")
Just name the variable inside the curly braces when naming the function, and then remember to pass that value when you call it later!
And there you have it! How to Define a Function in Python: It really is that simple, which is why so many people love Python! If you want to learn more about using functions, see How to Call a Function in Python.
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