On Fri, Oct 21, 2011 at 12:23 AM, Yingjie Lan <lany...@yahoo.com> wrote: > Hi, > > it seems a generator expression can be used only once: > >>>> g = (x*x for x in range(3)) >>>> for x in g: print x > 0 > 1 > 4 >>>> for x in g: print x #nothing printed >>>> > > Is there any way to revive g here?
If you're not generating very much, just use a list comprehension instead; you can iterate over the list as many times as you like: >>> g = [x*x for x in range(3)] >>> for x in g: print(x) 0 1 4 >>> for x in g: print(x) 0 1 4 Of course, since this is Python 3, you need the parens on print, but I assume you had something else you were doing with x. ChrisA -- http://mail.python.org/mailman/listinfo/python-list
