At 03:35 PM 8/12/2007, Steven Bethard wrote:
>Note that if you just want to iterate over all the primes, there's no
>need for the class at all. Simply write::
>
> for prime in iter_primes():

Even if I want to test only 1 integer, or want the list of primes in
a certain interval, I don't need the class at all:

====================================
import itertools

def iter_primes():
# an iterator of all numbers between 2 and +infinity
numbers = itertools.count(2)


# generate primes forever
while True:


# get the first number from the iterator (always a prime)
prime = numbers.next()
yield prime


# remove all numbers from the (infinite) iterator that are
# divisible by the prime we just generated
numbers = itertools.ifilter(prime.__rmod__, numbers)

def listPrimes(n,m):
"""
Returns the list of primes in closed interval [n,m]
"""
primes = []
for prime in iter_primes():
if prime > m:
return primes
if n <= prime <= m:
primes.append(prime)
============================================

Thanks for your help. I didn't learn much about classes, but
appreciated your iter_primes() a lot!

Dick Moores