<float>range(0.0,100.0,0.1)

[erik_wilsher at my-deja.com]

In article <DUCU4.21867$HG1.541688 at nnrp1.uunet.ca>,
  "Warren Postma" <embed at geocities.com> wrote:
> how do you do this:
>
> for i in range(0.0, 100.0, 0.1):
>     print i
>
you can make a frange object approximately like this:

(I did this a year ago, but can't find the code again, so this is
untested)

class frange:
    def __init__(self, min, max=None, step=None):
        if max == None:
            self.min = 0.
            self.max = min
        else:
            self.min = min
            self.max = max

        if step == 0.0:
            raise ValueError, "zero step for frange()"
        elif step == None:
            self.step = 1.0
        else:
            self.step = step

    def __getitem__(self,item):
        rv = self.min + self.step*item
        if rv >= self.max:   #not sure about the boundry here
            raise IndexError, "list index out of range"
        return rv

(rought code, no cheching for max < min, step < 0.0 etc)

The main point is that the iteration in python is terminated through an
IndexError exception.  GvR has indicated that the iteration control
will change in py3k.

      Erik Wilsher



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