coroutine equivalent of http://play.golang.org/p/lKBbS56f-n

goroutine2coroutine.py

#!/usr/bin/env python
# coroutine equivalent of http://play.golang.org/p/lKBbS56f-n

def generate(s,even,odd):
  for i,c in enumerate(s):
    if i%2 == 0:
      even.send(c)
    else:
      odd.send(c)

def count(char):
  def count_(char):
    sum = 0
    while True:
      c = yield
      if c == None:
        break
      if c == char:
        sum += 1
    yield sum
  rv = count_(char)
  rv.next()
  return rv

def main():
  c1,c2 = count('e'),count('o')
  generate("counting the number of some arbitrary values",c1,c2)
  print("%d odd  %s"%(c2.next(),'o'))
  print("%d even %s"%(c1.next(),'e'))

if __name__ == '__main__':
  main()