how to append to a symbolic expression in a loop?

stockh0lm
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This must be super basic, but i don't get how to do the classic

for i in list:
    expression = expression + i

symbolically. I want to add new terms to the expression, and the "==" notation does not mash well with that.

An .append() method would make sense, but i was not able to find one.

Comments

the = SR.zero() is the solution. I had defined expression as a symbolic variable and then it didn't work.

can you please move this to a proper answer so i can upvote it?

stockh0lm ( 2019-04-27 23:11:59 +0100 )edit

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Could you clarify your question? The following code works

sage: expression = SR.zero()
sage: for i in [SR.var('x'), SR.var('y'), SR.var('z')]:
....:     expression = expression + i
sage: expression
x + y + z

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Asked: 2019-04-27 22:18:13 +0100

Seen: 384 times

Last updated: Apr 27 '19