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fix iteration over Client...
fix iteration over Client I didn't intend for Client to be iterable, but defining `__getitem__` makes it iterable as long as engine IDs are continuous (not always the case). This explicitly defines `__iter__` so it behaves consistently.

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logtopics.rst
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Log Topic Specification

we use pyzmq to broadcast log events over a PUB socket. Engines, Controllers, etc. can all broadcast. SUB sockets can be used to view the logs, and ZMQ topics are used to help select out what to follow.

the PUBHandler object that emits the logs can ascribe topics to log messages. The order is:

<root_topic>.<loglevel>.<subtopic>[.<etc>]

root_topic is specified as an attribute