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I really like the new 'ExternalLanguage' cell in v11.3. Is there a way to tell the cell to use a specific conda environment, either as default or for a specific input cell?

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Mathematica can find anaconda:

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But doesn't list any of my envs

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Trying to register them fails without a message:

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Updates:

I can't start an external session:

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The syntax highlighting seems to be off, how do I turn it on?

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    $\begingroup$ The first part is answered by mathematica.stackexchange.com/q/167605/38205. The second part (syntax highlighting) isn't implemented for python. $\endgroup$ – b3m2a1 Mar 13 '18 at 20:28
  • $\begingroup$ @b3m2a1 What about not being able to run StartExternalSession for any conda environment, has anyone complained about that yet? $\endgroup$ – user5601 Mar 13 '18 at 20:31
  • $\begingroup$ ZMQ isn't installed for Conda. See this: mathematica.stackexchange.com/a/155815/38205 for how to get venv (or other types of distros) working. $\endgroup$ – b3m2a1 Mar 13 '18 at 20:35
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    $\begingroup$ Ah-ha, all I had to do was pip install zmq and now my conda env shows up in FindExternalEvaluators! $\endgroup$ – user5601 Mar 13 '18 at 20:44
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    $\begingroup$ The syntax highlight is not off, it is simply not implemented for python. $\endgroup$ – Szabolcs Mar 14 '18 at 8:58
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I've just answered a similar question here. Checkout that answer for an explanation of how what you want can be done in version 12.1+:

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