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Use StartExternalSession with Python (V12 Mac OS)?

Hi, I am using the new 12.0 release of Mathematica.

I have Python 2.7 installed on my Mac and it is working fine (from shell). When I execute

FindExternalEvaluators[]

it correctly identifies my Python installation. However, when I execute

StartExternalSession["Python"]

it fails, with the message:

"StartExternalSession::noinstall: No valid installations for system Python were found with the options specified."

Then I tried this:

StartExternalSession[<|"System" -> "Python", "Version" -> "2.7.10",
"Executable" -> "/usr/bin/python"|>]

That too fails:

StartExternalSession::replFail: The process for external system Python (/usr/bin/python) failed to start due to : no input returned from process.

What could be the problem?

Regards, Rangarajan
POSTED BY: Rangarajan Krishnamoorthy
2 Replies
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Teemu Ahola
Teemu Ahola, Nokia
Posted 5 years ago

I can confirm this as well. I have Ubuntu 18.04.2. Same fix worked for me.
POSTED BY: Teemu Ahola

Hi,

I just found out how to solve the problem I reported earlier. I have to install the "pyzmq" package for Python.

I did the following from my shell:

sudo pip install pyzmq

After this, StartExternalSession["Python"] works as expected.

Regards,

Rangarajan
POSTED BY: Rangarajan Krishnamoorthy
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