gen-4.py

class Malfunction(Exception):
    pass

def my_generator():
    print('starting up')

    val = yield 1
    print('got:', val)

    val = yield 2
    print('got:', val)

    try:
        yield 3
    except Malfunction:
        print('malfunction!')

    yield 4

    print('done')

gen = my_generator()

print(next(gen)) # start the generator
print(gen.send(10)) # send the value 10
print(gen.send(20)) # send the value 20
print(gen.throw(Malfunction())) # raise an exception inside the generator

try:
    next(gen)
except StopIteration:
    pass