Hi!
At
http://groups.google.com/group/sage-support/browse_thread/thread/38dfa72aff118470
David Madore asked a question about substitution.
While I tried to answer it, I found the following behaviour of subs()
that, to my knowledge, is technically impossible, given how keyword
arguments are passed in Python:
sage: R.<x0,x1,x2>=QQ[]
sage: S = QQ['x0,x1,x2,x3']
sage: p=S.random_element()
sage: p.subs(x2=x2)
2*x1^2 + 85*x0*x3 - 2*x0 - x3
That's fine. But this is not:
sage: p.subs({'x2':x2})
Traceback
...
TypeError: keys do not match self's parent
Isn't it the case that actually p.subs(x2=x2) is *equivalent* to p.subs
({'x2':x2}) in Python?
I am totally puzzled.
Best regards,
Simon
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