frange(), a range function with float increments (Python recipe) by Dinu Gherman ActiveState Code (http://code.activestate.com/recipes/66472/) Sadly missing in the Python standard library, this function allows to use ranges, just as the built-in function range(), but with float arguments. All thoretic restrictions apply, but in practice this is more useful than in theory.
When I worked at a daycare we would have bike day during the summer when kids, aged 3-5, could bring in their bikes and ride them, most of the kids were on big bikes with training wheels and a few of the 4-5 year olds were without training wheels.
 What to expect from your 16 to 18 month old . Month 16. Most toddlers should be able to. . . Turn pages of a book when you read. Gets attached to stuffed animal or other object. Walk well. Sing and like to sing. Get upset when frustrated. Some toddlers will probably be able to. . . Walk backwards.