#11919: Issue when pickling a formal function
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Reporter: cdsousa | Owner: burcin
Type: defect | Status: needs_work
Priority: minor | Milestone: sage-5.0
Component: symbolics | Resolution:
Keywords: pynac, pickling | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Michael Orlitzky | Merged in:
Dependencies: | Stopgaps:
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Changes (by burcin):
* status: positive_review => needs_work
Comment:
Replying to [comment:13 nbruin]:
> Fix confirmed! indeed, the patch simply adds back a line that
disappeared in #9240 without any reason stated, so probably that was just
an accident.
It was not an accident. The python_func flag stored in pynac is not a bool
any more. It is a bitmask that marks which custom functions are
implemented in Python. The rest, if they exist are C++ functions.
> Positive review!
This patch doesn't fix the problem. It might actually lead to crashes,
since pynac will look for a python function to call for evaluation,
differentiation, etc. if some bits in `python_func` are set.
The correct fix will be to get pynac to create a new dummy symbolic
function at the point where it raises an error with "unknown function 'f'
in archive." Relevant code can be found in `ginac/function.{h,cpp}` in
pynac sources.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11919#comment:15>
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