On May 15, 2012, at 4:35 PM, "[email protected]" <[email protected]> wrote:
> On 15 May 2012 23:32, Aaron Meurer <[email protected]> wrote: >> I had this idea before. See >> http://code.google.com/p/sympy/issues/detail?id=2006. >> >> I have no idea how hard it would be to implement, but my guess is that >> it wouldn't be easy. But if you have an idea how to do it go ahead and >> give it a shot. I think it would be really cool and very useful. >> > > I have done it with a rather trivial change if it was not for > something that *totally* surprised me: > >>>> Symbol('x')(1) # You will not believe what it returns > Function('x')(1) # Yes the symbol is transformed to a function > > In [6]: x.__call__?? > Type: instancemethod > Base Class: <type 'instancemethod'> > String Form:<bound method Symbol.__call__ of x> > Namespace: Interactive > File: /home/stefan/scientific_python_stack/sympy/sympy/core/symbol.py > Definition: x.__call__(self, *args) > Source: > def __call__(self, *args): > from function import Function > return Function(self.name)(*args) > > > May I please remove this feature if the tests do not fail? > > > The usual disclaimer: Maybe this feature (Symbol being a callable) is > necessary and I do not know the details. I will be happy to be > corrected. Tests will fail. See http://code.google.com/p/sympy/issues/detail?id=440. This is done to make parsing of undefined functions work in sympify(). To fix it we need to modify the parser. By the way, this feature is actually kind of useful, especially with isympy -a. Aaron Meurer > > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/sympy?hl=en. > -- You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/sympy?hl=en.
