Comment #15 on issue 2587 by [email protected]: Strange printing at SymPy Live
http://code.google.com/p/sympy/issues/detail?id=2587
After further investigation it appears that the assumptions for the two exponents in x**2+x**-2 are pointing to the same object after pickling.
In [1]: from pickle import dumps, loads In [2]: f = x**2+x**-2 In [3]: g = loads(dumps(f)) In [4]: f0 = f.args[0].args[1] # 2 In [5]: f1 = f.args[1].args[1] # -2 In [6]: g0 = g.args[0].args[1] # 2 In [7]: g1 = g.args[1].args[1] # -2 In [8]: f0.evalf() Out[8]: 2.00000000000000 In [9]: f1.evalf() Out[9]: -2.00000000000000 In [10]: g0.evalf() Out[10]: 2.00000000000000 In [11]: g1.evalf() Out[11]: -2.00000000000000 In [12]: f0.is_negative Out[12]: False In [13]: f1.is_negative Out[13]: True In [14]: g0.is_negative Out[14]: False In [15]: g1.is_negative Out[15]: False In [16]: f0._assumptions is f1._assumptions Out[16]: False In [17]: g0._assumptions is g1._assumptions Out[17]: True -- You received this message because you are subscribed to the Google Groups "sympy-issues" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/sympy-issues?hl=en.
