> But, that's what's happening right now as well. Symbol.__new__ is called and it is cached. Therefore, the problem persists.
Except that you will probably have the correct `args`. Check this first. I do not understand what is the issue with Symbol's __new__ could you show the code that actually raises this error? > So, how am I to add args? Answering the above question about `new` and `init` will probably show us what you are doing wrong and why you can not modify the `args`. If you insist doing it manually, just modify `_args`. But if you need to do it, you are probably doing something wrong. On 25 July 2013 18:30, Prasoon Shukla <prasoon92.i...@gmail.com> wrote: > @Stefan : Let us say I use __init__ instead. When I initialize a > BaseScalar, since a __new__ method isn't defined, that means the __new__ of > superclass (Symbol) will be called. > > But, that's what's happening right now as well. Symbol.__new__ is called > and it is cached. Therefore, the problem persists. > > Also, if I use __init__, then since Symbol.__new__ will be called first. > But, it throws an error: > __new__() takes exactly 2 arguments (4 given) > which is why I was using __new__ instead of __init__ in the first place. > > @Aaron: The symbols are initialized within another class instance. > Specifically, it represents field variables in a coordinate system. So, you > can initialize any number of rectangular coordinate system objects and each > will have a 'x' attribute that will represent the x coordinate variable. > Thus the same name. I took the position as strings initially - when the > BaseScalars were to be initialized by users - but that has changed now. I > can use ints instead. > > Anyway, here are the things I can do: > > I can change the superclass to Dummy since using __init__ instead of > __new__ doesn't work for the reasons I mentioned. I still do not see how to > fix this. You mention adding args to the object but how am I to do that? > Symbol.__new__ needs to be called one way or the other - and, it doesn't > allow for anything else but name and assumptions. And when it is called, it > returns a cached object. So, how am I to add args? > > One thing I can think of doing is to initialize a different named symbol > and change its name later on. How about that? > > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sympy+unsubscr...@googlegroups.com. > To post to this group, send email to sympy@googlegroups.com. > Visit this group at http://groups.google.com/group/sympy. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. For more options, visit https://groups.google.com/groups/opt_out.
