In Sage, "10" is a Sage integer, not a Python int. I am guessing that gateway.jvm.java.util.Random.nextInt expects a Python int for its input, and when it gets a Sage Integer, that causes a problem. What happens if you replace "random.nextInt(10)" with "random.nextInt(int(10))"?
On Wednesday, August 2, 2017 at 12:16:54 PM UTC-7, Paul DesJardin wrote: > > Hi, I'm new to using Sage and trying to interface to java classes using > py4j. I've been successful using py4j using an anaconda installed version > of python (on a mac) but I'm running into Attribute errors using Sage. The > one below is 'sage.rings.integer.Integer' object has no attribute > '_get_object_id'. I don't understand the reason for the differences and > how to interpret the errors I'm receiving. Any assistance or ideas of what > is causing this would be very much appreciated. Thank you, PD > > > > > sage: *from* *py4j.java_gateway* *import* JavaGateway > > sage: gateway = JavaGateway() > > sage: random = gateway.jvm.java.util.Random() > > sage: number1 = random.nextInt(*10*) > > --------------------------------------------------------------------------- > > AttributeError Traceback (most recent call > last) > > <ipython-input-4-45af4cb476cf> in <module>() > > ----> 1 number1 = random.nextInt(Integer(10)) > > > > /Applications/SageMath/local/lib/python2.7/site-packages/py4j/java_gateway.pyc > > in __call__(self, *args) > > * 1149* > > * 1150* def __call__(self, *args): > > -> 1151 args_command, temp_args = self._build_args(*args) > > * 1152* > > * 1153* command = proto.CALL_COMMAND_NAME +\ > > > > /Applications/SageMath/local/lib/python2.7/site-packages/py4j/java_gateway.pyc > > in _build_args(self, *args) > > * 1119* > > * 1120* args_command = "".join( > > -> 1121 [get_command_part(arg, self.pool) for arg in > new_args]) > > * 1122* > > * 1123* return args_command, temp_args > > > /Applications/SageMath/local/lib/python2.7/site-packages/py4j/protocol.pyc > in get_command_part(parameter, python_proxy_pool) > > * 288* command_part += ";" + interface > > * 289* else: > > --> 290 command_part = REFERENCE_TYPE + parameter._get_object_id() > > * 291* > > * 292* command_part += "\n" > > > /Applications/SageMath/src/sage/structure/element.pyx in > sage.structure.element.Element.__getattr__ > (/Applications/SageMath/src/build/cythonized/sage/structure/element.c:4230) > () > > * 457* AttributeError: > 'LeftZeroSemigroup_with_category.element_class' object has no attribute > 'blah_blah' > > * 458* """ > > --> 459 return self.getattr_from_category(name) > > * 460* > > * 461* cdef getattr_from_category(self, name): > > > /Applications/SageMath/src/sage/structure/element.pyx in > sage.structure.element.Element.getattr_from_category > (/Applications/SageMath/src/build/cythonized/sage/structure/element.c:4339) > () > > * 470* else: > > * 471* cls = P._abstract_element_class > > --> 472 return getattr_from_other_class(self, cls, name) > > * 473* > > * 474* def __dir__(self): > > > /Applications/SageMath/src/sage/structure/misc.pyx in > sage.structure.misc.getattr_from_other_class > (/Applications/SageMath/src/build/cythonized/sage/structure/misc.c:1933)() > > * 297* dummy_error_message.cls = type(self) > > * 298* dummy_error_message.name = name > > --> 299 raise dummy_attribute_error > > * 300* attribute = <object>attr > > * 301* # Check for a descriptor (__get__ in Python) > > > AttributeError: 'sage.rings.integer.Integer' object has no attribute > '_get_object_id' > -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at https://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
