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Learn Python #5
 Adding your own function

Creating new functions to solve your particular problems is one of the most useful things about a general-purpose programming language.

In the context of programming, a function is a named sequence of statements that performs a desired operation. This operation is specified in a function definition. The functions we have been using so far have been defined for us, and these definitions have been hidden. This is a good thing, because it allows us to use the functions without worrying about the details of their definitions.

The syntax for a function definition is:

def NAME( LIST OF PARAMETERS ):
  STATEMENTS