[Tutor] generators

bob gailer bgailer at gmail.com
Wed Apr 4 14:39:21 CEST 2012

To Joel's and Wesley's valuable comments I add:

Calling a generator function returns a /generator object/.

 >>> def x(n):
...  for i in range(n): yield i
 >>> y = x(3)
 >>> print y
<generator object x at 0x01333BE8>

A generator object can be used instead of some other "iterable" (e.g.) 
in for statements.
 >>> for i in y:print i

x in this case is equivalent to xrange() with exactly 1 argument.

There is more that can be said regarding x.next(). x.send(), raise 
StopIteration but I've said enough for now.

Bob Gailer
Chapel Hill NC

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