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I would like to run an external code, written in Fortran, C++, or Python, within Wolfram Mathematica 12 on my MAC OS. I looked up on Internet and I tried to read the WSTP documentation on Wolfram Mathematica, but I still was not able to solve my issue. Could you please provide me some examples explained step by step in order that I can understand the strategy and I can then implement to there external codes? Thanks for your help.

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You must first configure MMA to use Python. Here is how to proceed, from the help (version 12.1):

workflow/ConfigurePythonForExternalEvaluate

If you have done the setup, you can execute Python code inside a Notebook. You may e.g. type ">" (Greater) at the beginning of a line. This gives you a Python code cell, where you can type and execute Python code. E.g.:

enter image description here

Or you may create a Python session, using ExternalEvaluate as described in the help:

ref/ExternalValue

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