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Add warning about imports to all.py #41302

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14 changes: 14 additions & 0 deletions src/sage/all.py
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Expand Up @@ -2,6 +2,20 @@
all.py -- much of sage is imported into this module, so you don't
have to import everything individually.

WARNING:

Do not import from this module into other modules. Instead, import
from the orginal location. The tool `import_statements` helps in
figuring out where that location is. For instance::

sage: import_statements("TensorAlgebra")
from sage.algebras.tensor_algebra import TensorAlgebra

tells you that `TensorAlgebra` should be imported from
`sage.algebras.tensor_algebra`. While the binding is available in `sage.all`
as a `LazyImport`, you should not use that because it can lead to unexpected
results.

TESTS:

This is to test :issue:`10570`. If the number of stackframes at startup
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