import tetrahedron error

asked 2025-09-09 10:00:50 +0200

ortollj
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updated 2025-09-09 10:18:44 +0200

Sagemath10.4, Ubuntu24.04, WSL, Edge with Copilot, W11

AI Copilot said me :

that’s a classic SageMath quirk. The error:

from sage.plot.plot3d.shapes2 import tetrahedron

ImportError: cannot import name 'tetrahedron' from 'sage.plot.plot3d.shapes2'

means Sage doesn’t actually provide a tetrahedron function in that module, even though it seems like it should. That import line is misleading — and I’m guilty of trusting it too quickly.

#import sage.plot.plot3d.shapes2
#tetrahedron?
from sage.plot.plot3d.shapes2 import tetrahedron

is her,he,it right ?

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I forgot to precise :jupyter-notebook : 5.2.2

ortollj ( 2025-09-09 13:18:44 +0200 )edit

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answered 2025-09-25 15:59:58 +0200

eric_g
8599 ●10 ●62 ●169 https://people-lux.obs...

An alternative is to use Sage's function import_statements:

sage: import_statements("tetrahedron")
from sage.plot.plot3d.platonic import tetrahedron

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answered 2025-09-09 10:44:03 +0200

rburing

11059 ●6 ●81 ●222 https://www.rburing.nl/

updated 2025-09-09 10:47:03 +0200

Use the source: https://github.com/search?q=repo%3Asa...

Or within a SageMath session:

sage: search_src('def tetrahedron')
plot/plot3d/platonic.py:156:def tetrahedron(center=(0, 0, 0), size=1, **kwds):
geometry/polyhedron/library.py:1118:    def tetrahedron(self, backend=None):

The function is found in the file src/sage/plot/plot3d/platonic.py, so the correct import statement is:

from sage.plot.plot3d.platonic import tetrahedron

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but why if I write:

import sage.plot.plot3d.shapes2
tetrahedron?

then I access to tetrahedron ?

ortollj ( 2025-09-09 10:59:49 +0200 )edit

Ok, Copilot told me :

🧠 Sage’s Lazy Import System Sage uses a preloaded global namespace in its interactive environment (especially in Jupyter notebooks and the Sage REPL). This means: Many commonly used functions — like tetrahedron, sphere, Polyhedron, etc. — are automatically available without explicit import. Even if you don’t do from sage.plot.plot3d.shapes2 import tetrahedron, Sage has already made tetrahedron accessible via its startup scripts. So when you type tetrahedron?, Sage finds the function in its global registry and shows the docstring — even though you didn’t explicitly import it. Why import ... Works but from ... import tetrahedron Fails The module sage.plot.plot3d.shapes2 exists, but it doesn’t expose tetrahedron directly via its __init__.py.

ortollj ( 2025-09-09 13:34:36 +0200 )edit

Perhaps better than search_src('def tetrahedron') would be search_def('tetrahedron'): search_def is designed to search for where objects are defined.

John Palmieri ( 2025-09-25 23:02:31 +0200 )edit

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