Python 101 by Mihai Catalin Teodosiu

Author:Mihai Catalin Teodosiu
Language: eng
Format: epub
Tags: python, python programming, python 3, python crash course, learn python, python 101, python coding, python developer, python development, python for beginners
Publisher: Mihai Catalin Teodosiu

my_first_function()

This is our first function!

We basically created the help section for this function by using a docstring.

Inside a function, all the syntax rules of Python apply as you've learned up to this point in the book. Whether you're using for or while loops, if/elif/else blocks, dictionaries or list indexing and slicing inside your function, the exact same syntax rules apply.

Now, I mentioned earlier that functions are reusable blocks of code. Let's see why. After defining a function, with or without any parameters inside the parentheses, we can call that function whenever we need to run the code inside it. In order to call a function, you just need to type in that function's name, followed by the parentheses and that's it. Let's see this in action.

So, we have the my_first_function() function already defined. Let's call it inside the Python interpreter.

>>> my_first_function()

Hello Python!

>>> my_first_function()

Hello Python!

>>> my_first_function()

Hello Python!

As you can notice, each time we call the function the code inside that function gets executed. Of course, this is a very basic example of a function, but it should give you an overall understanding of this concept.

Another advantage of functions is that you can change the code within a function and see the results changing as well, the next time you call that function. Therefore, we can say that functions are dynamic structures. Let's redefine our function and change the code inside it. Then, on the next function call, the result should reflect the update we've just made.

def my_first_function():

print("Hello Java!")

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