Scripting

5.13    Functions

Python provides two options for defining your own functions: You can introduce ordinary functions using the def keyword. Alternatively, you can define and immediately apply what are called lambda functions with little overhead. Let’s start with ordinary functions.

The definition of functions starts with the def keyword. This keyword is followed by the function name, for which the same rules apply as for variable names. The parameters must be enclosed in parentheses.

def myfunc(para1, para2, para3):    code 

Some rules for programming and using functions include the following:

• Functions must be defined before they can be used. As a result, a common practice is to define all functions first and then specify the rest of the code. ...