range()
Function
If you do need to iterate over a sequence of numbers, the built-in
function range()
comes in handy. It generates lists containing
arithmetic progressions, e.g.:
>>> range(10) [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] >>>The given end point is never part of the generated list;
range(10)
generates a list of 10 values, exactly the legal indices for items of a
sequence of length 10. It is possible to let the range start at another
number, or to specify a different increment (even negative):
>>> range(5, 10) [5, 6, 7, 8, 9] >>> range(0, 10, 3) [0, 3, 6, 9] >>> range(-10, -100, -30) [-10, -40, -70] >>>To iterate over the indices of a sequence, combine
range()
and
len()
as follows:
>>> a = ['Mary', 'had', 'a', 'little', 'lamb'] >>> for i in range(len(a)): ... print i, a[i] ... 0 Mary 1 had 2 a 3 little 4 lamb >>>