[Tutor] while loop ends prematurly

[brian arb]

Hello,
Can some please explain this to me?
My while loop should continue while "owed" is greater than or equal to "d"

first time the function is called
the loop exits as expected
False: 0.000000 >= 0.010000
the next time it does not
False: 0.010000 >= 0.010000

Below is the snippet of code, and the out put.

Thanks!

def make_change(arg):
  denom = [100.0, 50.0, 20.0, 10.0, 5.0, 1.0, 0.25, 0.10, 0.05, 0.01]
  owed = float(arg)
  payed = []
  for d in denom:
    while owed >= d:
      owed -= d
      b = owed >= d
      print '%s: %f >= %f' % (b, owed, d)
      payed.append(d)
  print sum(payed), payed
  return sum(payed)

if __name__ == '__main__':
  values = [21.48, 487.69] #, 974.41, 920.87, 377.93, 885.12, 263.47,
630.91, 433.23, 800.58]
  for i in values:
    make_change(i))


False: 1.480000 >= 20.000000
False: 0.480000 >= 1.000000
False: 0.230000 >= 0.250000
True: 0.130000 >= 0.100000
False: 0.030000 >= 0.100000
True: 0.020000 >= 0.010000
True: 0.010000 >= 0.010000
False: 0.000000 >= 0.010000
21.48 [20.0, 1.0, 0.25, 0.1, 0.1, 0.01, 0.01, 0.01]
True: 387.690000 >= 100.000000
True: 287.690000 >= 100.000000
True: 187.690000 >= 100.000000
False: 87.690000 >= 100.000000
False: 37.690000 >= 50.000000
False: 17.690000 >= 20.000000
False: 7.690000 >= 10.000000
False: 2.690000 >= 5.000000
True: 1.690000 >= 1.000000
False: 0.690000 >= 1.000000
True: 0.440000 >= 0.250000
False: 0.190000 >= 0.250000
False: 0.090000 >= 0.100000
False: 0.040000 >= 0.050000
True: 0.030000 >= 0.010000
True: 0.020000 >= 0.010000
False: 0.010000 >= 0.010000
487.68 [100.0, 100.0, 100.0, 100.0, 50.0, 20.0, 10.0, 5.0, 1.0, 1.0, 0.25,
0.25, 0.1, 0.05, 0.01, 0.01, 0.01]
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