Goal: Learn about functions in python.

 
A function can be created using the def statement as shown below.

def myadd(a, b):
 c = a*10 + b
 return c

Note once again that the statements inside the function are indented after the "def" statement. To invoke the function we do the following:

addvalue = myadd(2, 5)

It is possible to return multiple values using comma separated names in the return statement inside the function.

def myaddsub(a, b):
 c = a*10 + b
 d = a*10 - b
 return c, d

In this case the function is invoked as follows:

addvalue, subvalue = myaddsub(2, 5)

The function definition can also be done in a way such that default values for input parameters can be set.

def myaddsub(a, b, base=10):
 c = a*base + b
 d = a*base - b
 return c, d

Then, when you need base to take a different value than the default 10, you can:

addvalue, subvalue = myaddsub(2, 5, base=2)