GitHub user Leemoonsoo reopened a pull request:

    [ZEPPELIN-3284] z.getInterpreterContext().out().clear() broken in Python 

    ### What is this PR for?
    import time
    time.sleep(0.5)     # in case of Ipython kernel, print may not immediately 
flushed and cleared.
    Expected to print `world` only.
    This worked in zeppelin-0.7.x and it'll be nice keep this feature in the 
future version.
    ### What type of PR is it?
    Bug fix | Improvement
    ### What is the Jira issue?
    ### How should this be tested?
    * First time? Setup Travis CI as described on
    * Strongly recommended: add automated unit tests for any new or changed 
    * Outline any manual steps to test the PR here.
    ### Screenshots (if appropriate)
    ### Questions:
    * Does the licenses files need update?
    * Is there breaking changes for older versions?
    * Does this needs documentation?

You can merge this pull request into a Git repository by running:

    $ git pull ZEPPELIN-3284

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #2829
commit 224a2df8e64d203a5270f1948e013c14f78b52cb
Author: Lee moon soo <moon@...>
Date:   2018-03-03T00:50:22Z

    make z.getInterpreterContext().out().clear() work in PythonInterpreter

commit e0dcda61fa55d794b8de2f74a61454b46506f5ed
Author: Lee moon soo <moon@...>
Date:   2018-03-03T01:42:41Z

    make z.getInterpreterContext().out().clear() work in  IPythonInterprete



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