OK. I added a pull request: https://github.com/sympy/sympy/pull/8307
On Friday, October 24, 2014 4:24:41 PM UTC-5, Aaron Meurer wrote:
>
> Go ahead and open a pull request with this change, and we can review
> it, and see if it breaks any tests, and so on.
>
> Aaron Meurer
>
> On Fri, Oct 24, 2014 at 7:55 AM, Duane Nykamp <dqny...@comcast.net
> <javascript:>> wrote:
> > The following throws an error
> >
> > In [27]: f=Function('f')
> >
> > In [28]: parse_expr('af(t)', local_dict={'f': f },
> > transformations=(auto_symbol, auto_number, split_symbols,
> > implicit_multiplication))
> >
> ---------------------------------------------------------------------------
> > TypeError Traceback (most recent call
> last)
> >
> > [snip]
> >
> > TypeError: unbound method as_base_exp() must be called with f instance
> as
> > first argument (got nothing instead)
> >
> >
> > The code it is trying to evaluate is
> >
> > Symbol ('a' )*(f )*(Symbol ('t' ))
> >
> > It seems the problem is the parentheses around f that were inserted in
> line
> > 394:
> > result.extend([(OP, '('), (NAME, "%s" %
> char),
> > (OP, ')'),
> > (NAME, 'Symbol'), (OP, '(')])
> >
> > Is there any reason to add those parenthesis? Certainly, if char is a
> > function, they should not be added. I'm not sure if there are cases
> where
> > one does need those parenthesis.
> >
> > I can fix the problem by changing this line to
> > result.extend([(NAME, "%s" % char),
> > (NAME, 'Symbol'), (OP, '(')])
> > but I'm not sure if I should test if local_dict[char] or
> global_dict[char]
> > is callable (similar to _get_token_callable) and only remove the
> parenthesis
> > if it is callable.
> >
> > For this to work, I also have to modify the approach to remove the last
> 2
> > tokens (rather than 3) and then skip the following token so that the
> close
> > parenthesis from the original Symbol is not included.
> >
> > Does this fix seem reasonable?
> >
> > Duane
> >
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