Mini-Reference

Generator definition:

def generator(args):
    ...
    yield something
    yield from something_else
    ...
    return result

Generator instance operations:

g = generator(args)
next(g)
g.send(value)
g.close()
g.throw(exc, val, tb)
result = yield from gen



In [1]:

    
def gen():
    message = 'Hello'
    while True:
        print('gen: ready to yield %r' % message)
        item = yield message
        print('gen: got %r' % item)
        message = 'message for %s' % item



In [2]:

    
g = gen()
g









    Out[2]:





<generator object gen at 0xb4b6c2ac>



In [3]:

    
a = next(g)
a









    



gen: ready to yield 'Hello'






    Out[3]:





'Hello'



In [4]:

    
a = g.send('one')
a









    



gen: got 'one'
gen: ready to yield 'message for one'






    Out[4]:





'message for one'



In [5]:

    
a = g.send('two')
a









    



gen: got 'two'
gen: ready to yield 'message for two'






    Out[5]:





'message for two'