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I want to use specific python libraries via the Mathematica frontend. This is possible as follows

In[30]:= ExternalEvaluate["Python", "from sympy import isprime; isprime(7)"]

Out[30]= True

However, if I directly try to evaluate the same using > at the beginning of a line to use an external code cell, this does not work. For instance,

> from sympy import isprime; isprime(7)

gives as output,

Failure[[WarningSign] Message: No module named 'sympy' Tag: PythonError ]

Any ideas on how to make this work from external code cells.

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    $\begingroup$ It works for me on 13.2 with some modules e.g os, sys, math and so on. Maybe it's something to do with the PYTHONPATH. Try import sys; sys.path in both ExternalEvaluate and the code cell and see if there's a difference. $\endgroup$ Commented Jan 5, 2023 at 22:55
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    $\begingroup$ If I pip install sympy globally (as admin) then importing sympy works and both evaluate to True, so either you're on an older Mathematica where there's a discrepancy between the two choices of path, or something is wrong with your python setup. $\endgroup$ Commented Jan 5, 2023 at 23:20
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    $\begingroup$ @flinty: Thanks a lot. Yes there was a difference in the sys.path between the two as the external code cell was accessing a different python distribution. After unregistering the problematic one, things are fine. $\endgroup$ Commented Jan 6, 2023 at 2:10

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