i just tried something with solving a equation, i think i did it the
wrong way, but still it should not result in this:

def calc_wights_by_sum(s)
    variables = var(["w" + str(i) for i in range(s.nvertices())])
    equation = reduce(lambda f1,f2: f1 + f2, [variables[i] * s.vertex(i)
for i in range(s.nvertices())]) == 0
    print equation
    return solve(equation,variables)

sage: calc_wights_by_sum(s)
False
Exception RuntimeError: 'maximum recursion depth exceeded in
__subclasscheck__' in <type 'exceptions.RuntimeError'> ignored
Exception RuntimeError: RuntimeError('maximum recursion depth exceeded
in cmp',) in Exception RuntimeError: 'maximum recursion depth exceeded
in __subclasscheck__' in <type 'exceptions.RuntimeError'> ignored
 ignored
Exception RuntimeError: 'maximum recursion depth exceeded in
__subclasscheck__' in <type 'exceptions.RuntimeError'> ignored
Exception RuntimeError: RuntimeError('maximum recursion depth exceeded
in cmp',) in Exception RuntimeError: 'maximum recursion depth exceeded
in __subclasscheck__' in <type 'exceptions.RuntimeError'> ignored
[...]

i just helped to kill python by killall -9 python.

greatz Johannes

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