Issue 1171: (x**2).evalf(subs={x:0}) raises TypeError: NoneType is not
iterable
http://code.google.com/p/sympy/issues/detail?id=1171
New issue report by greg.sidier:
system config:
sympy-0.6.2
python-2.5.2
sample code causing bug:
>>> import sympy
>>> from sympy.abc import x
>>> print (x**2).evalf(subs={x:0.0})
<ipython console> in <module>()
/lib/python2.5/site-packages/sympy/core/evalf.pyc in Basic_evalf(x, n,
**options)
954 options['maxprec'] = max(prec, DEFAULT_MAXPREC)
955 try:
--> 956 result = evalf(x, prec+4, options)
957 except NotImplementedError:
958 # Fall back to the ordinary evalf
/lib/python2.5/site-packages/sympy/core/evalf.pyc in evalf(x, prec, options)
894 def evalf(x, prec, options):
895 try:
--> 896 r = evalf_table[x.func](x, prec, options)
897 except KeyError:
898 #r = finalize_complex(x._eval_evalf(prec)._mpf_, fzero,
prec)
/lib/python2.5/site-packages/sympy/core/evalf.pyc in evalf_pow(v, prec,
options)
406 if case == 3: return None, fneg(z), None, target_prec
407 # General complex number to arbitrary integer power
--> 408 re, im = libmpc.mpc_pow_int((re, im), p, prec)
409 # Assumes full accuracy in input
410 return finalize_complex(re, im, target_prec)
/lib/python2.5/site-packages/sympy/mpmath/libmpc.pyc in mpc_pow_int(z, n,
prec, rnd)
176 if n == 0: return mpc_one
177 if n == 1: return mpc_pos(z, prec, rnd)
--> 178 if n == 2: return mpc_mul(z, z, prec, rnd)
179 if n == -1: return mpc_div(mpc_one, z, prec, rnd)
180 if n < 0: return mpc_div(mpc_one, mpc_pow_int(z, -n, prec+4),
prec, rnd)
/lib/python2.5/site-packages/sympy/mpmath/libmpc.pyc in mpc_mul((a, b), (c,
d), prec, rnd)
51 imaginary parts separately."""
52
---> 53 asign, aman, aexp, abc = a
54 bsign, bman, bexp, bbc = b
55 csign, cman, cexp, cbc = c
TypeError: 'NoneType' object is not iterable
Issue attributes:
Status: New
Owner: ----
Labels: Type-Defect Priority-Medium
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