The Python language also allows you to create your own functions. Functions are like miniature programs within your script. They come in handy when you're going to do the same thing repeatedly because you can just call that function anytime you want it.
For example, let's create a function that multiplies variables by 3. This function will let us drop any variable we want into it and it will return the answer. Write the following lines into your script.
#These first lines define a new function
named newlitter.
#This function accepts one #variable which will be called
'animal'
#within the body of the function.
def newlitter(animal):
#Multiply the given variable
by three.
newnumber = animal*3
#Return a value.
return
newnumber
#Call the function and put the variable "pigs"
into it.
# The variable "new_pigs" will be equal to the
value that was returned from the function.
new_pigs = newlitter(pigs)
#Call the function again, but this time put the variable
cows into it.
new_cows = newlitter(cows)
#Print the products of the function.
print "The
new number of pigs is", new_pigs
print "The
new number of cows is", new_cows
Once a function has been written into a script, you can call it anytime you want to use it.
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