Traversing sage's symbolic expression trees in python

asked 2012-11-12 18:16:40 +0200

rmp251
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I'm writing some python code around sage and I need to build an expression tree of the following basic form:

each node represents an operation
each child tree represents an expression tree to which the operation applies

Can anyone point me in the right direction as to how to traverse an instance of sage.symbolic.expression.Expression, so as to extract this kind of semantic information?

answered 2012-11-13 18:08:19 +0200

Volker Braun
3281 ●11 ●30 ●75

Did you read TFM? There is a Converterclass to build your own expressions trees: http://www.sagemath.org/doc/reference...

If you want to do it by hand you can use

sage: eq = x*sin(x)
sage: eq.op
Operands of x*sin(x)
sage: list(eq.op)
[x, sin(x)]

but I'd recommend you use the Converter

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Thank you. op and operator are what I was looking for. I did read TFM but it's pretty... complete. It takes a while to find the needle in the haystack.

rmp251 ( 2012-11-13 18:53:09 +0200 )edit

@Volker - I'm gonna choose not to edit this, but please choose your language more carefully on this forum. I'm proud that Sage (usually) doesn't sink to the level of some other forums...

kcrisman ( 2012-11-14 12:38:26 +0200 )edit

Update. The corresponding manual entry is now at

https://doc.sagemath.org/html/en/reference/calculus/sage/symbolic/expression_conversions.html

slelievre ( 2021-04-13 21:33:07 +0200 )edit

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