Does python suck or I am just stupid?

Mark VandeWettering wettering at attbi.com
Sun Feb 23 03:54:23 CET 2003


In article <41948401.0302221000.6257443f at posting.google.com>, Andy
Mroczkowski wrote:

> I've been tearing my hair out over a bug(?) I've come across.  I've
> only been programming in Python for a few months so I'm no expert.
> I've seen the same behavior in Python2.2 on several different
> machines.  Instead of banging my head against the wall even more, I
> thought I would ask the community for help.
>
> A good example of it is in the following code snippet.
>
>
> ########################### BEGIN #########################
> #!/usr/bin/env python
>
> u = 0.0 u_inc = 0.001
>
> v = (0.0, 0.0, 0.0, 0.25, 0.25, 0.5, 0.5, 0.75, 0.75, 1.0, 1.0, 1.0)
>
> while u <= 1.0: for x in v: if u == x: print u, x u = u + u_inc
> ######################### END ##########################
>
> I would expect to see the following output:  0.0 0.0 0.0 0.0 0.0 0.0
> 0.25 0.25 0.25 0.25 0.5 0.5 0.5 0.5 0.75 0.75 0.75 0.75 1.0 1.0 1.0
> 1.0 1.0 1.0
>
> However, I just see:  0.0 0.0 0.0 0.0 0.0 0.0
>
>
> What is wrong?  Is this some weird feature?  Or is Python broken?  And
> sorry if this is something silly that I'm overlooking on my part.

Floating point math doesn't work.  It isn't just a problem with Python.

	Mark
> 
> Andy M.




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