Does python suck or I am just stupid?

[Andy Mroczkowski]

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.

Andy M.