Clean Code in Python

Sending and receiving data to and from a sub-generator

Now, we will see the other nice feature of the yield from syntax, which is probably what gives it its full power. As we have already introduced when we explored generators acting as coroutines, we know that we can send values and throw exceptions at them, and, in such cases, the coroutine will either receive the value for its internal processing, or it will have to handle the exception accordingly.

If we now have a coroutine that delegates into other ones (such as in the previous example), we would also like to preserve this logic. Having to do so manually would be quite complex (you can take a look at the code described in PEP-380 if we didn't have this handled by yield from automatically. ...