Our statements so far,
speed = input()
duration = input()
distance = duration * speed
have calculated the quantity distance based on the input
values of speed and duration, but we don't know
what it is because that value exists only inside the memory of our computer.
To see it we need to output it where we can look at it. The most common output
command in Python is the print statement. To print the value of
distance we would simply use the command,
print distance
We can also print the values of expressions, e.g.
print 2**8 - 1