iterator-from-calls

from greenlet import greenlet                                                                                             
from functools import update_wrapper                                                                                                                                     
 def iter_from_func(f, args, kwargs):                                                
     p = greenlet.getcurrent()                                                       
     g = greenlet(lambda: f(lambda x: p.switch((x,)), *args, **kwargs), p)           
     while 1:                                                                          
         rv = g.switch()                                                               
         if rv is None:                                                                
             return                                                                    
         yield rv[0]                                                                   
                                                                                       
 def funciter(f):                                                                      
     return update_wrapper(lambda *a, **kw: iter_from_func(f, a, kw), f)               
 @funciter                                                                             
 def my_enumerate(yield_func, iterable):                                               
     idx = 0                                                                           
     itereator = iter(iterable)                                                        
     while 1:                                                                          
         yield_func((idx, iterator.next()))                                            
         idx += 1 

@funciter
def my_enumerate(yield_func, iterable):
    idx	= 0  	 	
    iterator = iter(iterable)

    while 1:
        yield_func((idx, iterator.next()))
	idx += 1



>>>list(my_enumerate('abc'))
[(0,'a'), (1, 'b'), (2,'c')]