Comment #5 on issue 2684 by [email protected]: Deepcopy does not work
on evaluate False
http://code.google.com/p/sympy/issues/detail?id=2684
I'm using Sympy in a project where this issue came up - that is, pickle was
not able to handle Sympy Functions which were constructed using a keyword
arg, such as evaluate=False.
I was able to mpnkey-patch a fix based on this post:
http://stackoverflow.com/questions/5238252/unpickling-new-style-with-kwargs-not-possible
The workaround which allowed me to progress is rather dirty, and I haven't
tried it with a superclass (i.e. to get Mul(a,b,evaluate=False) to work):
def _Function__reduce__(self):
args = self.__getnewargs__()
kwargs = self._assumptions
return new_Function, (self.__class__, args, kwargs), None
Function.__reduce__ = _Function__reduce__
def new_Function(cls, args, kwargs):
return cls.__new__(cls, *args, **kwargs)
That's for sympy 0.6.7 and it's rather naive, but I'm putting this here
with the hope to save someone else a bit of work when trying to completely
resolve this issue....
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