Please, do not take this too seriously!!!
Basic (as in "head of an expression tree") has the signature
*expression_trees -> expression_tree
A rule has the signature
expression_tree -> expression_tree
So a rule is just a special case of Basic. How cool will it be to have
expression trees like
factor(expand(hundreds_of_MBs_of_Expr))
and being able to evaluate this without doing the `expand` (yes, it is
a bad example, but you get the idea).
Now it is the time to mention Greenspuns Tenth Rule Of Programming
http://c2.com/cgi/wiki?GreenspunsTenthRuleOfProgramming
And to remind you that this was already discussed many months ago:
https://groups.google.com/forum/?fromgroups=#!topic/sympy/fCQEdSQybTM
But python is not lisp and this will probably never happen.
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