Learning how to define a function in Python is one of the most important steps to mastering the language. Functions are blocks of code that perform a specific task and can be “called” from any point ...

You can define a function anywhere in your code. When you first start with Python this generally means defining functions within a module, i.e. at the “top level”. However, there is nothing wrong with ...

Read an excerpt from the 4th Edition of the book Python Essential Reference by David Beazley. Excerpt from Python Essential Reference, 4th Edition. Substantial programs are broken up into functions ...