>
> Still happens with beta5. Do you want to open a ticket?
>
>
Confirmed and see http://trac.sagemath.org/ticket/17985
> ┌────────────────────────────────────────────────────────────────────┐
> │ Sage Version 6.6.beta5, Release Date: 2015-03-13 │
> │ Type "notebook()" for the browser-based notebook interface. │
> │ Type "help()" for help. │
> └────────────────────────────────────────────────────────────────────┘
> ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
> ┃ Warning: this is a prerelease version, and it may be unstable. ┃
> ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
> sage: GaussianIntegers = NumberField(x^2+1, 'I').ring_of_integers()
> sage: A = GaussianIntegers([2,1])
> sage: A.n()
> ---------------------------------------------------------------------------
> RuntimeError Traceback (most recent call last)
> <ipython-input-3-f924bd0d29c9> in <module>()
> ----> 1 A.n()
>
> /mnt/disk/home/release/Sage/src/sage/structure/element.pyx in
> sage.structure.element.Element.numerical_approx
> (build/cythonized/sage/structure/element.c:7435)()
> 743 """
> 744 from sage.misc.functional import numerical_approx
> --> 745 return numerical_approx(self, prec=prec, digits=digits,
> 746 algorithm=algorithm)
> 747 n = numerical_approx
>
> /mnt/disk/home/release/Sage/local/lib/python2.7/site-packages/sage/misc/functional.pyc
>
> in numerical_approx(x, prec, digits, algorithm)
> 1333 # The issue is not precision, try conversion instead
> 1334 try:
> -> 1335 return RR(x)
> 1336 except (TypeError, ValueError):
> 1337 pass
>
> /mnt/disk/home/release/Sage/src/sage/structure/parent.pyx in
> sage.structure.parent.Parent.__call__
> (build/cythonized/sage/structure/parent.c:9602)()
> 1092 if mor is not None:
> 1093 if no_extra_args:
> -> 1094 return mor._call_(x)
> 1095 else:
> 1096 return mor._call_with_args(x, args, kwds)
>
> /mnt/disk/home/release/Sage/src/sage/structure/coerce_maps.pyx in
> sage.structure.coerce_maps.NamedConvertMap._call_
> (build/cythonized/sage/structure/coerce_maps.c:5819)()
> 236 raise TypeError("Cannot coerce {} to {}".format(x, C))
> 237 cdef Map m
> --> 238 cdef Element e = method(C)
> 239 if e is None:
> 240 raise RuntimeError("BUG in coercion model: {} method
> of {} returned None".format(self.method_name, type(x)))
>
> /mnt/disk/home/release/Sage/src/sage/rings/number_field/number_field_element.pyx
>
> in sage.rings.number_field.number_field_element.NumberFieldElement._mpfr_
> (build/cythonized/sage/rings/number_field/number_field_element.cpp:15017)()
> 1383 return R(self.base_ring()(self))
> 1384 else:
> -> 1385 return R(R.complex_field()(self))
> 1386
> 1387 def __float__(self):
>
> /mnt/disk/home/release/Sage/local/lib/python2.7/site-packages/sage/rings/complex_field.pyc
>
> in __call__(self, x, im)
> 349 if im is not None:
> 350 x = x, im
> --> 351 return Parent.__call__(self, x)
> 352
> 353 def _element_constructor_(self, x):
>
> /mnt/disk/home/release/Sage/src/sage/structure/parent.pyx in
> sage.structure.parent.Parent.__call__
> (build/cythonized/sage/structure/parent.c:9602)()
> 1092 if mor is not None:
> 1093 if no_extra_args:
> -> 1094 return mor._call_(x)
> 1095 else:
> 1096 return mor._call_with_args(x, args, kwds)
>
> /mnt/disk/home/release/Sage/src/sage/structure/coerce_maps.pyx in
> sage.structure.coerce_maps.DefaultConvertMap_unique._call_
> (build/cythonized/sage/structure/coerce_maps.c:4496)()
> 108 print type(C), C
> 109 print type(C._element_constructor),
> C._element_constructor
> --> 110 raise
> 111
> 112 cpdef Element _call_with_args(self, x, args=(), kwds={}):
>
> /mnt/disk/home/release/Sage/src/sage/structure/coerce_maps.pyx in
> sage.structure.coerce_maps.DefaultConvertMap_unique._call_
> (build/cythonized/sage/structure/coerce_maps.c:4403)()
> 103 cdef Parent C = self._codomain
> 104 try:
> --> 105 return C._element_constructor(x)
> 106 except Exception:
> 107 if print_warnings:
>
> /mnt/disk/home/release/Sage/local/lib/python2.7/site-packages/sage/rings/complex_field.pyc
>
> in _element_constructor_(self, x)
> 391 except AttributeError:
> 392 pass
> --> 393 return complex_number.ComplexNumber(self, x)
> 394
> 395 def _coerce_map_from_(self, S):
>
> /mnt/disk/home/release/Sage/src/sage/rings/complex_number.pyx in
> sage.rings.complex_number.ComplexNumber.__init__
> (build/cythonized/sage/rings/complex_number.c:4167)()
> 182 try:
> 183 R = parent._real_field()
> --> 184 rr = R(real)
> 185 ii = R(imag)
> 186 mpfr_set(self.__re, rr.value, rnd)
>
> /mnt/disk/home/release/Sage/src/sage/structure/parent.pyx in
> sage.structure.parent.Parent.__call__
> (build/cythonized/sage/structure/parent.c:9602)()
> 1092 if mor is not None:
> 1093 if no_extra_args:
> -> 1094 return mor._call_(x)
> 1095 else:
> 1096 return mor._call_with_args(x, args, kwds)
>
> /mnt/disk/home/release/Sage/src/sage/structure/coerce_maps.pyx in
> sage.structure.coerce_maps.NamedConvertMap._call_
> (build/cythonized/sage/structure/coerce_maps.c:5819)()
> 236 raise TypeError("Cannot coerce {} to {}".format(x, C))
> 237 cdef Map m
> --> 238 cdef Element e = method(C)
> 239 if e is None:
> 240 raise RuntimeError("BUG in coercion model: {} method
> of {} returned None".format(self.method_name, type(x)))
>
> /mnt/disk/home/release/Sage/src/sage/rings/number_field/number_field_element.pyx
>
> in sage.rings.number_field.number_field_element.NumberFieldElement._mpfr_
> (build/cythonized/sage/rings/number_field/number_field_element.cpp:15017)()
> 1383 return R(self.base_ring()(self))
> 1384 else:
> -> 1385 return R(R.complex_field()(self))
> 1386
> 1387 def __float__(self):
>
> /mnt/disk/home/release/Sage/local/lib/python2.7/site-packages/sage/rings/complex_field.pyc
>
> in __call__(self, x, im)
> 349 if im is not None:
> 350 x = x, im
> --> 351 return Parent.__call__(self, x)
> 352
> 353 def _element_constructor_(self, x):
>
> /mnt/disk/home/release/Sage/src/sage/structure/parent.pyx in
> sage.structure.parent.Parent.__call__
> (build/cythonized/sage/structure/parent.c:9602)()
> 1092 if mor is not None:
> 1093 if no_extra_args:
> -> 1094 return mor._call_(x)
> 1095 else:
> 1096 return mor._call_with_args(x, args, kwds)
>
> /mnt/disk/home/release/Sage/src/sage/structure/coerce_maps.pyx in
> sage.structure.coerce_maps.DefaultConvertMap_unique._call_
> (build/cythonized/sage/structure/coerce_maps.c:4496)()
> 108 print type(C), C
> 109 print type(C._element_constructor),
> C._element_constructor
> --> 110 raise
> 111
> 112 cpdef Element _call_with_args(self, x, args=(), kwds={}):
>
> /mnt/disk/home/release/Sage/src/sage/structure/coerce_maps.pyx in
> sage.structure.coerce_maps.DefaultConvertMap_unique._call_
> (build/cythonized/sage/structure/coerce_maps.c:4403)()
> 103 cdef Parent C = self._codomain
> 104 try:
> --> 105 return C._element_constructor(x)
> 106 except Exception:
> 107 if print_warnings:
>
> /mnt/disk/home/release/Sage/local/lib/python2.7/site-packages/sage/rings/complex_field.pyc
>
> in _element_constructor_(self, x)
> 391 except AttributeError:
> 392 pass
> --> 393 return complex_number.ComplexNumber(self, x)
> 394
> 395 def _coerce_map_from_(self, S):
>
> /mnt/disk/home/release/Sage/src/sage/rings/complex_number.pyx in
> sage.rings.complex_number.ComplexNumber.__init__
> (build/cythonized/sage/rings/complex_number.c:4167)()
> 182 try:
> 183 R = parent._real_field()
> --> 184 rr = R(real)
> 185 ii = R(imag)
> 186 mpfr_set(self.__re, rr.value, rnd)
>
> /mnt/disk/home/release/Sage/src/sage/structure/parent.pyx in
> sage.structure.parent.Parent.__call__
> (build/cythonized/sage/structure/parent.c:9602)()
> 1092 if mor is not None:
> 1093 if no_extra_args:
> -> 1094 return mor._call_(x)
> 1095 else:
> 1096 return mor._call_with_args(x, args, kwds)
>
> /mnt/disk/home/release/Sage/src/sage/structure/coerce_maps.pyx in
> sage.structure.coerce_maps.NamedConvertMap._call_
> (build/cythonized/sage/structure/coerce_maps.c:5819)()
> 236 raise TypeError("Cannot coerce {} to {}".format(x, C))
> 237 cdef Map m
> --> 238 cdef Element e = method(C)
> 239 if e is None:
> 240 raise RuntimeError("BUG in coercion model: {} method
> of {} returned None".format(self.method_name, type(x)))
>
> /mnt/disk/home/release/Sage/src/sage/rings/number_field/number_field_element.pyx
>
> in sage.rings.number_field.number_field_element.NumberFieldElement._mpfr_
> (build/cythonized/sage/rings/number_field/number_field_element.cpp:15017)()
> 1383 return R(self.base_ring()(self))
> 1384 else:
> -> 1385 return R(R.complex_field()(self))
> 1386
> 1387 def __float__(self):
>
> /mnt/disk/home/release/Sage/local/lib/python2.7/site-packages/sage/rings/complex_field.pyc
>
> in __call__(self, x, im)
> 349 if im is not None:
> 350 x = x, im
> --> 351 return Parent.__call__(self, x)
> 352
> 353 def _element_constructor_(self, x):
>
> /mnt/disk/home/release/Sage/src/sage/structure/parent.pyx in
> sage.structure.parent.Parent.__call__
> (build/cythonized/sage/structure/parent.c:9602)()
> 1092 if mor is not None:
> 1093 if no_extra_args:
> -> 1094 return mor._call_(x)
> 1095 else:
> 1096 return mor._call_with_args(x, args, kwds)
>
> /mnt/disk/home/release/Sage/src/sage/structure/coerce_maps.pyx in
> sage.structure.coerce_maps.DefaultConvertMap_unique._call_
> (build/cythonized/sage/structure/coerce_maps.c:4496)()
> 108 print type(C), C
> 109 print type(C._element_constructor),
> C._element_constructor
> --> 110 raise
> 111
> 112 cpdef Element _call_with_args(self, x, args=(), kwds={}):
>
> /mnt/disk/home/release/Sage/src/sage/structure/coerce_maps.pyx in
> sage.structure.coerce_maps.DefaultConvertMap_unique._call_
> (build/cythonized/sage/structure/coerce_maps.c:4403)()
> 103 cdef Parent C = self._codomain
> 104 try:
> --> 105 return C._element_constructor(x)
> 106 except Exception:
> 107 if print_warnings:
>
> /mnt/disk/home/release/Sage/local/lib/python2.7/site-packages/sage/rings/complex_field.pyc
>
> in _element_constructor_(self, x)
> 391 except AttributeError:
> 392 pass
> --> 393 return complex_number.ComplexNumber(self, x)
> 394
> 395 def _coerce_map_from_(self, S):
>
> /mnt/disk/home/release/Sage/src/sage/rings/complex_number.pyx in
> sage.rings.complex_number.ComplexNumber.__init__
> (build/cythonized/sage/rings/complex_number.c:4167)()
> 182 try:
> 183 R = parent._real_field()
> --> 184 rr = R(real)
> 185 ii = R(imag)
> 186 mpfr_set(self.__re, rr.value, rnd)
>
> /mnt/disk/home/release/Sage/src/sage/structure/parent.pyx in
> sage.structure.parent.Parent.__call__
> (build/cythonized/sage/structure/parent.c:9602)()
> 1092 if mor is not None:
> 1093 if no_extra_args:
> -> 1094 return mor._call_(x)
> 1095 else:
> 1096 return mor._call_with_args(x, args, kwds)
>
> /mnt/disk/home/release/Sage/src/sage/structure/coerce_maps.pyx in
> sage.structure.coerce_maps.NamedConvertMap._call_
> (build/cythonized/sage/structure/coerce_maps.c:5819)()
> 236 raise TypeError("Cannot coerce {} to {}".format(x, C))
> 237 cdef Map m
> --> 238 cdef Element e = method(C)
> 239 if e is None:
> 240 raise RuntimeError("BUG in coercion model: {} method
> of {} returned None".format(self.method_name, type(x)))
>
> /mnt/disk/home/release/Sage/src/sage/rings/number_field/number_field_element.pyx
>
> in sage.rings.number_field.number_field_element.NumberFieldElement._mpfr_
> (build/cythonized/sage/rings/number_field/number_field_element.cpp:15017)()
> 1383 return R(self.base_ring()(self))
> 1384 else:
> -> 1385 return R(R.complex_field()(self))
> 1386
> 1387 def __float__(self):
>
> /mnt/disk/home/release/Sage/local/lib/python2.7/site-packages/sage/rings/complex_field.pyc
>
> in __call__(self, x, im)
> 349 if im is not None:
> 350 x = x, im
> --> 351 return Parent.__call__(self, x)
> 352
> 353 def _element_constructor_(self, x):
>
> /mnt/disk/home/release/Sage/src/sage/structure/parent.pyx in
> sage.structure.parent.Parent.__call__
> (build/cythonized/sage/structure/parent.c:9602)()
> 1092 if mor is not None:
> 1093 if no_extra_args:
> -> 1094 return mor._call_(x)
> 1095 else:
> 1096 return mor._call_with_args(x, args, kwds)
>
> /mnt/disk/home/release/Sage/src/sage/structure/coerce_maps.pyx in
> sage.structure.coerce_maps.DefaultConvertMap_unique._call_
> (build/cythonized/sage/structure/coerce_maps.c:4496)()
> 108 print type(C), C
> 109 print type(C._element_constructor),
> C._element_constructor
> --> 110 raise
> 111
> 112 cpdef Element _call_with_args(self, x, args=(), kwds={}):
>
> /mnt/disk/home/release/Sage/src/sage/structure/coerce_maps.pyx in
> sage.structure.coerce_maps.DefaultConvertMap_unique._call_
> (build/cythonized/sage/structure/coerce_maps.c:4403)()
> 103 cdef Parent C = self._codomain
> 104 try:
> --> 105 return C._element_constructor(x)
> 106 except Exception:
> 107 if print_warnings:
>
> /mnt/disk/home/release/Sage/local/lib/python2.7/site-packages/sage/rings/complex_field.pyc
>
> in _element_constructor_(self, x)
> 391 except AttributeError:
> 392 pass
> --> 393 return complex_number.ComplexNumber(self, x)
> 394
> 395 def _coerce_map_from_(self, S):
>
> /mnt/disk/home/release/Sage/src/sage/rings/complex_number.pyx in
> sage.rings.complex_number.ComplexNumber.__init__
> (build/cythonized/sage/rings/complex_number.c:4167)()
> 182 try:
> 183 R = parent._real_field()
> --> 184 rr = R(real)
> 185 ii = R(imag)
> 186 mpfr_set(self.__re, rr.value, rnd)
>
> /mnt/disk/home/release/Sage/src/sage/structure/parent.pyx in
> sage.structure.parent.Parent.__call__
> (build/cythonized/sage/structure/parent.c:9602)()
> 1092 if mor is not None:
> 1093 if no_extra_args:
> -> 1094 return mor._call_(x)
> 1095 else:
> 1096 return mor._call_with_args(x, args, kwds)
>
> /mnt/disk/home/release/Sage/src/sage/structure/coerce_maps.pyx in
> sage.structure.coerce_maps.NamedConvertMap._call_
> (build/cythonized/sage/structure/coerce_maps.c:5819)()
> 236 raise TypeError("Cannot coerce {} to {}".format(x, C))
> 237 cdef Map m
> --> 238 cdef Element e = method(C)
> 239 if e is None:
> 240 raise RuntimeError("BUG in coercion model: {} method
> of {} returned None".format(self.method_name, type(x)))
>
> /mnt/disk/home/release/Sage/src/sage/rings/number_field/number_field_element.pyx
>
> in sage.rings.number_field.number_field_element.NumberFieldElement._mpfr_
> (build/cythonized/sage/rings/number_field/number_field_element.cpp:15017)()
> 1383 return R(self.base_ring()(self))
> 1384 else:
> -> 1385 return R(R.complex_field()(self))
> 1386
> 1387 def __float__(self):
>
> /mnt/disk/home/release/Sage/local/lib/python2.7/site-packages/sage/rings/complex_field.pyc
>
> in __call__(self, x, im)
> 349 if im is not None:
> 350 x = x, im
> --> 351 return Parent.__call__(self, x)
> 352
> 353 def _element_constructor_(self, x):
>
> /mnt/disk/home/release/Sage/src/sage/structure/parent.pyx in
> sage.structure.parent.Parent.__call__
> (build/cythonized/sage/structure/parent.c:9602)()
> 1092 if mor is not None:
> 1093 if no_extra_args:
> -> 1094 return mor._call_(x)
> 1095 else:
> 1096 return mor._call_with_args(x, args, kwds)
>
> ...
>
>
> /mnt/disk/home/release/Sage/src/sage/misc/cachefunc.pyx in
> sage.misc.cachefunc.WeakCachedFunction.__call__
> (build/cythonized/sage/misc/cachefunc.c:7801)()
> 1280 if self._argument_fixer is None:
> 1281 self.argfix_init()
> -> 1282 k = self._fix_to_pos(*args, **kwds)
> 1283 else:
> 1284 if self._default_key is not None:
>
> RuntimeError: maximum recursion depth exceeded while calling a Python
> object
> sage:
>
>
>
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