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
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