Can you open an issue in the issue tracker for this? I agree that sets
should not be allowed.
Aaron Meurer
On Thu, Jul 9, 2020 at 3:08 AM Roberto <franceschini.robe...@gmail.com> wrote:
>
> I have seen that lambdify wants a list for the arguments to be treated as
> symbols. This list can be also give as a python set, e.g. {x,y,z }, which is
> exactly what would be returned by a .free_symbol property. If lambdify is
> feed a set like that of the output of .free_symbol it may change their order
> in the conversion from set to list. This is done silently and may cause major
> disfunction in the use of the lamdified function because you think x is x,
> but is y instead and so on.
> I would like to ask developers to check for the type of the lambdify list of
> arguments and throw a warning to flag that a set is being converted and that
> the ordering is not guaranteed.
> Given that .free_symbols returns a set, not a list, this is very common
> pitfall in my opinion and must be prevented.
>
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