Comment #8 on issue 2006 by [email protected]: Make all expressions
recursively callable
http://code.google.com/p/sympy/issues/detail?id=2006
Just before continuing with the removal, here is another proposal (I am not
after a compromise, so accept it only if you completely agree):
The _recursive_call helper can check whether there are any callable objects
in the tree on it's first call (the user call) and raise an error with a
nice explanation if there is no such object. A problem is that library code
will need to catch the error, and I have mixed feelings about this, but it
will work well for interactive use. I can implement it now and provide a
pull request.
If you are against this proposal, then I probably will need the private
helper to be left as it is for use in the diffgeom module.
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