code evalution for inline shell execution

[Ruslan Dautkhanov]

Hello,

Apache Zeppelin is adding functionaility similar to Jupyter inline shell execution with {code} substitution, like

a = !ls -l dir/{var1+3}

https://issues.apache.org/jira/browse/ZEPPELIN-2807

https://issues.apache.org/jira/browse/ZEPPELIN-1967

https://github.com/apache/zeppelin/pull/2502 

Can somebody please point to Jupyter documentation around this feature?

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.

Thanks,

Ruslan Dautkhanov

[Thomas Kluyver]

Hi Ruslan,

On 1 August 2017 at 07:19, Ruslan Dautkhanov <dautk...@gmail.com> wrote:

Can somebody please point to Jupyter documentation around this feature?

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().

 

Best wishes,

Thomas

[Ruslan Dautkhanov]

Thank you Thomas.

--
Ruslan Dautkhanov

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