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Merge pull request #998 from minrk/homedir...
Merge pull request #998 from minrk/homedir defer to stdlib os.path.expanduser('~') for path.get_home_dir() frozen env still comes first, and My Documents registry query is fallback on Windows, but in all normal cases, expanduser is used, which has $HOME as first priority. IPython also no longer considers finding no writable home dir as a fatal error. closes #810 closes #747 closes #970
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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