Status: New
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 1474 by tom.denniston: Subs broken on sub classes of Symbol using
sympy 0.6.4 on linux
http://code.google.com/p/sympy/issues/detail?id=1474
When I subclass sympy.Symbol as below I cannot .subs() for that symbol in
an expression. For instance if I define this subclass:
In [8]: class Mysymbol(sympy.Symbol):
pass
...:
In [10]:
Then I try to subs 'X' for 'B' where B is a sympy.Symbol no problem:
In [11]: (sympy.Symbol('A')*sympy.Symbol('B')).subs('B','X')
Out[11]: A*X
Then I try to subs 'X' for 'B' where B is a Mysymbol, problem:
In [12]: (sympy.Symbol('A')*Mysymbol('B')).subs('B','X')
Out[12]: A*B
Incidentally a mysymbol within the expression if it is not what I am trying
to replace is harmless but, oddly, changes the order of the result.
In [13]: (Mysymbol('A')*sympy.Symbol('B')).subs('B','X')
Out[13]: X*A
Is there something I should be doing when sub classing or is this simply a
bug? I googled around this site for issues related. I found something on
sqrts that appears to be fixed in 0.6.4 from what I can tell.
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