Status: Accepted
Owner: smichr
CC: jensen.oyvind
Labels: Type-Defect Priority-Medium
New issue 1920 by smichr: SymTuple doesn't rebuild itself
http://code.google.com/p/sympy/issues/detail?id=1920
most objects have the relationship that
expr.func(*expr.args)
returns the original object. This does not work for SymTuple:
Type "help", "copyright", "credits" or "license" for more information.
from sympy import *
from sympy.physics.secondquant import SymTuple
var('x');y=SymTuple((x,))
x
y
SymTuple(x)
y.func(*y.args)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "sympy\physics\secondquant.py", line 154, in __new__
obj = Basic.__new__(cls,*arg_tuple, **kw_args)
TypeError: __new__() argument after * must be a sequence, not Symbol
In this case, one must use y.func(y.args). It would be nice if it's
behavior were consistent with other sympy objects. I think it might be as
easy as wrapping the tuple as a singleton tuple.
y.func(*((x,),))
SymTuple(x)
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