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Merge pull request #4542 from ivanov/history-clear...
Merge pull request #4542 from ivanov/history-clear new `ipython history clear` subcommand This new subcommand is equivalent to ipython history trim --HistoryTrim.keep=0, which is now supported (and also has a more convenient --keep alias) This command comes with a fix to bash completion of flags for ipython history subcmd also included is a tiny fix for nbconvert completion that was pointed out by @jakobgager in #4528 also included is a change to our utils.io.ask_yes_no function that allows for specifying the behavior of a KeyboardInterrupt.
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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