Status: Accepted Owner: Vinzent.Steinberg CC: smichr Labels: Type-Defect Priority-Medium
New issue 1907 by Vinzent.Steinberg: Pow(..., evaluate=something) is broken http://code.google.com/p/sympy/issues/detail?id=1907 In [11]: Add(Pow(y, 2, evaluate=True), Mul(-1, Pow(y, 2))) Out[11]: 2 2 y - y In [12]: Add(Pow(y, 2, evaluate=False), Mul(-1, Pow(y, 2))) --------------------------------------------------------------------------- AttributeError Traceback (most recent call last) /home/one/src/sympy/<ipython console> in <module>() /home/one/src/sympy/sympy/core/cache.pyc in wrapper(*args, **kw_args) 83 except KeyError: 84 pass ---> 85 func_cache_it_cache[k] = r = func(*args, **kw_args) 86 return r 87 /home/one/src/sympy/sympy/core/operations.pyc in __new__(cls, *args, **assumptions) 29 if len(args)==1: 30 return _sympify(args[0]) ---> 31 c_part, nc_part, order_symbols = cls.flatten(map(_sympify, args)) 32 if len(c_part) + len(nc_part) <= 1: 33 if c_part: obj = c_part[0] /home/one/src/sympy/sympy/core/add.pyc in flatten(cls, seq) 108 newseq.append(Mul(c,s)) 109 --> 110 noncommutative = noncommutative or not s.is_commutative 111 112 # nan AttributeError: is_commutative In [13]: Add(Pow(y, 2), Mul(-1, Pow(y, 2))) Out[13]: 0 The exception has to be fixed and the first result is problematic. Please note that expand() works. -- You received this message because you are listed in the owner or CC fields of this issue, or because you starred this issue. You may adjust your issue notification preferences at: http://code.google.com/hosting/settings -- 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.
