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Groups > comp.lang.python > #5394

I don't understand generator.send()

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#! /usr/bin/env python

def ints():
    i=0
    while True:
        yield i
        i += 1

gen = ints()
while True:
    i = gen.next()
    print i
    if i==5:
        r = gen.send(2)
        print "return:",r
    if i>10:
        break

I thought the send call would push the value "2" at the front of the
queue. Instead it coughs up the 2, which seems senseless to me.

1/ How should I view the send call? I'm reading the manual and dont' get
it
2/ Is there a way to push something in the generator object? So that it
becomes the next yield expression? In my code I was hoping to get
0,1,2,3,4,5,2,6,7 as yield expressions.

Victor.


-- 
Victor Eijkhout -- eijkhout at tacc utexas edu

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I don't understand generator.send() see@sig.for.address (Victor Eijkhout) - 2011-05-14 19:08 -0500
  Re: I don't understand generator.send() "OKB (not okblacke)" <brenNOSPAMbarn@NObrenSPAMbarn.net> - 2011-05-15 00:38 +0000
  Re: I don't understand generator.send() Chris Angelico <rosuav@gmail.com> - 2011-05-15 10:47 +1000
    Re: I don't understand generator.send() see@sig.for.address (Victor Eijkhout) - 2011-05-14 20:40 -0500
  Re: I don't understand generator.send() Chris Rebert <crebert@ucsd.edu> - 2011-05-14 17:47 -0700
  Re: I don't understand generator.send() Ian Kelly <ian.g.kelly@gmail.com> - 2011-05-14 18:57 -0600
  Re: I don't understand generator.send() Ian Kelly <ian.g.kelly@gmail.com> - 2011-05-14 19:05 -0600
  Re: I don't understand generator.send() Chris Angelico <rosuav@gmail.com> - 2011-05-15 11:17 +1000
  Re: I don't understand generator.send() Ian Kelly <ian.g.kelly@gmail.com> - 2011-05-14 21:03 -0600

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