On 31 Mar, 21:50, Vinzent Steinberg <vinzent.steinb...@googlemail.com>
wrote:
> I'm not sure whether as_dummy() is really useful.
I think of it as akin to the way you would use prime in hand writing,
like using x' as an integration variable for a function of x.
>
> Shouldn't just passing the assumptions work? I'm -1 on special-casing
> is_commutative.
Yeah, it looks unnecessary, perhaps it should rather be fixed
somewhere else? I don't
know why it is not passed along with the assumptions.
Øyvind
>
> Vinzent
>
> 2010/3/31, Øyvind Jensen <jensen.oyv...@gmail.com>:
>
> > Added a test.
> > ---
> > sympy/core/symbol.py | 2 +-
> > sympy/core/tests/test_symbol.py | 12 ++++++++++++
> > 2 files changed, 13 insertions(+), 1 deletions(-)
>
> > diff --git a/sympy/core/symbol.py b/sympy/core/symbol.py
> > index 8f5db2a..e405fbb 100644
> > --- a/sympy/core/symbol.py
> > +++ b/sympy/core/symbol.py
> > @@ -64,7 +64,7 @@ def _hashable_content(self):
> > return (self.is_commutative, self.name)
>
> > def as_dummy(self):
> > - return Dummy(self.name, **self.assumptions0)
> > + return Dummy(self.name, self.is_commutative, **self.assumptions0)
>
> > def __call__(self, *args):
> > return Function(self.name, nargs=len(args))(*args,
> > **self.assumptions0)
> > diff --git a/sympy/core/tests/test_symbol.py
> > b/sympy/core/tests/test_symbol.py
> > index ffa0f8e..5fb82ff 100644
> > --- a/sympy/core/tests/test_symbol.py
> > +++ b/sympy/core/tests/test_symbol.py
> > @@ -18,6 +18,18 @@ def test_Symbol():
> > assert Symbol("x") == Symbol("x")
> > assert Symbol("x", dummy=True) != Symbol("x", dummy=True)
>
> > +def test_as_dummy_nondummy():
> > + x = Symbol('x')
> > + x1 = x.as_dummy()
> > + assert x1 != x
> > + assert x1 != x.as_dummy()
> > + # assert x == x1.as_nondummy()
> > +
> > + x = Symbol('x', commutative = False)
> > + x1 = x.as_dummy()
> > + assert x1 != x
> > + assert x1.is_commutative == False
> > + # assert x == x1.as_nondummy()
>
> > def test_lt_gt():
> > x, y = Symbol('x'), Symbol('y')
> > --
> > 1.6.5
>
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