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Read section 6.1 in the book and do the examples.
Let's create a new fruitful function:
def add_three(x, y, z):
"""Returns the sum of three numbers."""
return x + y + z
We can test this out:
>>> x = add_three(1, 3, 5)
>>> x
9
>>>
Sometimes we need to use conditionals, as the book shows. Here's another example:
def largest_of_three(x, y, z):
"""Returns the largest of three numbers."""
if x >= y and x >= z:
return x
else:
#here, either y > x or z > x
if y > z:
#in this case, y must be greater than x too, so just return
return y
else:
#in this case, z must be greater than x and y
return z
Test it!
>>> x = largest_of_three(1, 3, 5)
>>> x
5
>>> largest_of_three(2, 4, 2)
4
>>> largest_of_three(-100, -100, -100)
-100