[Tutor] Importing question

[Dick Moores]

At 07:55 AM 7/13/2007, Eric Brunson wrote:
>Dick Moores wrote:
>>At http://wiki.python.org/moin/SimplePrograms I found this code:
>>
>>============================================
>>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
>>
>>          # this code iteratively builds up a chain of
>>          # filters...slightly tricky, but ponder it a bit
>>          numbers = itertools.ifilter(prime.__rmod__, numbers)
>>
>>for p in iter_primes():
>>     if p > 1000:
>>         break
>>     print p
>>====================================================
>>
>>It works for me in Win XP, Python 2.5.
>>
>>However, in trying to dig into the code to understand it, I'm not 
>>able to find itertools.py, even though itertools is found in the 
>>docs at < http://www.python.org/doc/2.4/lib/module-itertools.html>.
>>A search of my Python25 directory doesn't turn up an itertools.py.
>>
>>So my question is, how does the first line of the code work? /Where 
>>/is itertools?
>
>On my Fedora 7 system it is in 
>/usr/lib/python2.5/lib-dynload/itertoolsmodule.so.

Hm. I have no lib-dyload, nor an itertoolsmodule.

Dick


>Note the difference in naming for built in binary modules.