Github user Tagar commented on the issue:
https://github.com/apache/zeppelin/pull/2502
Info from Jupyter comitter @takluyver
> It's fairly brief, but here:
>
http://ipython.readthedocs.io/en/stable/interactive/reference.html#manual-capture-of-command-output-and-magic-output
>
> E.g. found that quoting of curly brackets is done using {{..}} etc.
> If this documentation doesn't exist (I can't find where this is
documented), please point to code
> that handles this logic.
>
> The expansion of variables and expressions is done by the var_expand()
method:
>
https://github.com/ipython/ipython/blob/8f50a3771614d3e22505eabc9332d1bc44af6f0e/IPython/core/interactiveshell.py#L3037
>
> Running a shell command and capturing the output is the getoutput()
method:
>
https://github.com/ipython/ipython/blob/8f50a3771614d3e22505eabc9332d1bc44af6f0e/IPython/core/interactiveshell.py#L2279
>
> The escaped double curly braces {{...}} is part of Python's standard
string formatting machinery, which we use in var_expand().
>
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