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. _______________________________________________ Tutor maillist - [email protected] http://mail.python.org/mailman/listinfo/tutor
