The CPython differences documentation here:

  http://doc.pypy.org/en/latest/cpython_differences.html

References the exception `SystemError('PyTuple_SetItem called on tuple after  
use of tuple")’ but it’s not clear when/why this exception gets triggered.

I’m trying to use scipy with pypy, and the ODE integrator is raising this 
exception for code that works on CPython.  I can’t figure out what I might 
change in the configuration or the ODE integrator, or whether to conclude that 
this is a bug in scipy’s compatibility with pypy.

Thanks,

--Bill
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