Function parameters

Functions allow you to take code that is repeated and move it to a module that can be called when needed. Functions are defined with the def keyword and must be declared before the function is called in your code. Functions can accept one or more parameters and return values.

Functions

def function_name(parameter):
    # code to execute
    return value

Parameters can be assigned a default value making them optional when the function is called.

def function_name(parameter=default):
    # code to execute
    return value

When you call a function you may specify the values for the parameters using positional or named notation

def function_name(parameter1, parameter2):
    # code to execute
    return value

# Positional notation pass in arguments in same order as parameters are declared
result = function_name(value1,value2)

# Named notation
result = function_name(parameter1=value1, parameter2=value2)