That's it! You're recommendation worked like a charm. I certainly didn't appreciate the differences between Sage type and python number types. Thank you John - very much appreciated. Paul
sage: *from* *py4j.java_gateway* *import* JavaGateway sage: gateway = JavaGateway() sage: random = gateway.jvm.java.util.Random() sage: number1 = random.nextInt(int(*10*)) sage: number1 4 On Wednesday, August 2, 2017 at 3:37:15 PM UTC-4, John H Palmieri wrote: > > 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.
