Jython 2.7b1 (default:ac42d59644e9, Feb 9 2013, 15:24:52)
[OpenJDK Server VM (Sun Microsystems Inc.)] on java1.6.0_27
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>>> import sympy
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "sympy/__init__.py", line 49, in <module>
    from sympy.core import *
  File "sympy/core/__init__.py", line 8, in <module>
    from expr import Expr, AtomicExpr
  File "sympy/core/expr.py", line 2885, in <module>
    class AtomicExpr(Atom, Expr):
TypeError: Error when calling the metaclass bases
    multiple bases have instance lay-out conflict