I would like to pass Mathematica variable values to Python. But I found that it was not that trivial. For example, a typical way would be:
session = StartExternalSession["Python"];
l = Range[10];
res = ExternalEvaluate[session, "
l=list(<*l*>)
print(l)
l
"];
DeleteObject[session];
The results are: a Python expression [1, 2, 3, 4, 5, 6, 7, 8, 9, 10].
res
{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
It seems to work. However, when I tried to define a Mathematica function with local variables:
f[l_] := Module[
{session, res},
session = StartExternalSession["Python"];
res = ExternalEvaluate[session, "
l=list(<*l*>)
print(l)
l
"];
DeleteObject[session];
Return[res]
]
Clear[l]
f[Range[10]]
it didn't work. It looks like the "<* *>" notation doesn't accept local variables (in this case, l_List). I tried several patterns, but all my attempts failed in vain. After all, I needed to override the local variable l_LIst with another global variable l_List as follows.
l = Range[10];
f[Range[10]]
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
{1, 2, 3, 4, 5, 6, 7, 8, 9, 10}
Did I miss something? Any suggestion would be welcome.
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