#x starts at 1 and goes up to 80 @ intervals of 2
for x in range(1, 80, 2):
print(x)
>>> a = ['foo', 'bar', 'baz']
>>> for i in a:
... print(i)
...
foo
bar
baz
print(range(4))
>>> [0,1,2,3]
print(range(1,4))
>>> [1,2,3]
print(range(2,10,2))
>>> [2,4,6,8]