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Here's a subclass that doesn't send on push...

class MyAsyncChat(asynchat.async_chat):
    def push (self, data):
        self.producer_fifo.push (simple_producer (data))

That's it.

And according to my reading of asynchat and asyncore, while
actually trying to send data during a push() may trigger the
handle_error() method to be called, by default, the
handle_error() method logs the error and closes the socket.
 Errors don't seem to propagate out of push().