#20194: expression conversion bug with Sympy functions
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Reporter: rws | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-7.2
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
Dependencies: | Stopgaps:
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Description changed by rws:
Old description:
> With the Sympy-1.0 upgrade (#20185)
> {{{
> sage: import sympy
> sage: u = sympy.Function('u'); n = sympy.Symbol('n', integer=True)
> sage: sympy.sympify(3*u(n), evaluate=False)
> NotImplementedError: SymPy function 'u' doesn't exist
> }}}
> which disappears when `3*u(n)` is changed to `u(n)*3` or `u(n)`
New description:
With the Sympy-1.0 upgrade (#20185)
{{{
sage: import sympy
sage: u = sympy.Function('u'); n = sympy.Symbol('n', integer=True)
sage: sympy.sympify(3*u(n), evaluate=False)
/home/ralf/sage/local/lib/python2.7/site-
packages/sympy-1.0-py2.7.egg/sympy/parsing/sympy_parser.pyc in
flatten(self, args, func)
922 result = []
923 for arg in args:
--> 924 if isinstance(arg, ast.Call) and arg.func.id == func:
925 result.extend(self.flatten(arg.args, func))
926 else:
AttributeError: 'Call' object has no attribute 'id'
}}}
which disappears when `3*u(n)` is changed to `u(n)*3` or `u(n)`
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Ticket URL: <http://trac.sagemath.org/ticket/20194#comment:1>
Sage <http://www.sagemath.org>
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