foo.py

from itertools import chain, cycle, izip, imap, islice
def fizzbuzz(count):
  cycler = lambda mod_n, mod_label: cycle((mod_n - 1) * [''] + [mod_label])
  str_value = lambda (index, (fizz, buzz)): (fizz + buzz) or str(index + 1)
  take = lambda n, iterable: islice(iterable, n)
  data = take(count, enumerate(izip(cycler(3, 'fizz'), cycler(5, 'buzz'))))
  return imap(str_value, data)

test_fb = lambda n: list(fizzbuzz(n))

def make_readonly_prop(obj, name, attr_name=None):
  """
  Makes a read only property on the object obj named name from the obj attribute
  named attr_name. The attribute name defaults to name prepended with '_'
  """
  if not attr_name:
    attr_name = '_' + name
  if hasattr(obj, attr_name) and not hasattr(obj, name):
    setattr(obj.__class__, name,  property(lambda x: getattr(obj, '_' + name)))
    
def make_ro_properties(obj, *prop_names):
  for name in names:
    make_readonly_prop(obj, name)