>>> from sage.all import *
>>> exec(preparse(r"""
... a = 2^3
... print a
... """))8>>> a8>>> exit> py$a8
or also:
>>> load("some.sage") #I believe all sage power is available in load() but not
>>> all in exec(preparse()).
segunda-feira, 13 de Agosto de 2018 às 18:07:41 UTC+1, Emmanuel Charpentier
escreveu:
>
> Motivation : see this ask.sagemath.org question
> <https://ask.sagemath.org/question/43258/is-there-a-way-to-start-a-sage-session-from-a-session-of-its-python-interpreter/>
> .
> Tl;dr : I want to call sage from the R reticulate
> <https://github.com/rstudio/reticulate> package in order to create mixed
> text/R/Sage documents.
>
> - I am aware that Sagetex allows this, at least when using Sage's R in
> a \LaTeX document.
> - But this solution doesn't extend to noweb Markdown documents, which
> are more and more in demand (Web pages, ebooks, other interactive gadgets).
> - I have checked that the \LaTeX--> Markdown/whatever conversion
> currently doable with pandoc or similar tools is cumbersome to the extreme
> and/or loses a lot of information.
>
> Done so far : when used as the "Python" interpreter, Sage starts a Python
> session of its own interpreter (i. e. doesn't start the usual IPython
> session). The various environment variables are correctly defined.
>
> Thanks to Thierry Monteil, I have been able to create this Sage IPython
> session, with correct initialization (preparsing, imports, etc...). I have
> checked that this session can access R objects, and that the R session can
> access objects created in Sage.
>
> But this is insufficient :
>
> - The Sage session does not (re-)starts automatically : one has to
> explicitly call IPython.embed(). Not a problem when tran manually ;
> problematic for the intended use (creating Sage code chunks in a noweb
> document).
> - To get back to R, you have to exit twice : from the IPython session
> then from the Python session. Again not a problem in interactive use,
> again
> a serious problem for the intended use.
>
> So the question is : how can one *replace* the Python REPL with Sage's ?
> A serious look at $SAGE_ROOT/src/sage/repl/ipython_extension.py wasn't
> specially enlightening...
>
> Any ideas ?
>
> [ Note that this answer is necessary to the "right" function, but not
> sufficient : the name of the Python object interfacing Python to the
> **calling** R session is, unfortunately "r". Which is the standard name
> we have picked for our **called** R interpreter... So some r-handling
> will be necessary from reticulate's side. Keeping the distinction between
> those may be necessary (e. g. : reusing old code...).
> But I feel that asking for a patch has better chances if we "do our
> homework first", by solving *our* side of the problem *before* asking for
> help... ]
>
>
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