On second thought, I should just fix this now. 

Am I correct I need to install package r-3.6.2 and rebuld? 

On Wednesday, April 8, 2020 at 11:54:39 AM UTC-5, hbetx9 wrote:
>
> Tried from source and got this error:
>
> Error building Sage.
>
> The following package(s) may have failed to build (not necessarily
> during this run of 'make all-start'):
>
> * package: r-3.6.2
>   log file: /home/lmiller/sage-9.0/logs/pkgs/r-3.6.2.log
>   build directory: /home/lmiller/sage-9.0/local/var/tmp/sage/build/r-3.6.2
>
> which I'm guessing is only needed if one wants to use integration with R. 
> At this time I don't but in future I might, should I install R and 
> rebuild?  Build took a LONG time. 
>
> Also, version 9 is now in ~/SAGE_ROOT/local but the system version is 
> still 8.1. I guess I need to modify path or create a symlink to get sage 
> available to terminal on boot? 
>
> Finally, can the color scheme for sage on the terminal be changed? I used 
> a dark background so this is not easy to read. 
>
> Thanks in advance!
>
> On Wednesday, April 8, 2020 at 12:14:48 AM UTC-5, Dima Pasechnik wrote:
>>
>> On Wed, Apr 8, 2020 at 11:05 AM hbetx9 <lance....@gmail.com> wrote: 
>>
>> >     I installed from package on Mint 19.3. I'm happy to run whatever is 
>> needed to help diagnose. For context, I have installed python 2.7.17 and 
>> the package pulled sage 8.1. I'm not sure why the packages didn't pull the 
>> most up to date. Is there a PPA I need to add? 
>> > 
>>
>> my understanding is that MInt 19 by default follows Ubunu 18.04 (which 
>> indeed has Sage 8.1). 
>> We'd recommend you to build Sage (say, the latest stable version, 9.0) 
>> from source instead. 
>> While latest Ubuntu does have Sage 9.0, I don't know how to get it 
>> installed on your Mint, from PPA or otherwise. 
>> Perhaps you can ask on a Mint forum. 
>>
>> HTH 
>> Dima 
>>
>>
>> > Best, 
>> > Lance 
>> > 
>> > On Saturday, April 4, 2020 at 9:49:09 PM UTC-5, Dima Pasechnik wrote: 
>> >> 
>> >> On Sun, Apr 5, 2020 at 7:44 AM Lance Edward Miller <lem...@uark.edu> 
>> wrote: 
>> >> > 
>> >> > After install on Linux Mint 19.3, I got the following crash report. 
>> Any help is appreciated. 
>> >> 
>> >> What exactly have you installed? 
>> >> A binary installation, or done a build from sources? 
>> >> 
>> >> > 
>> >> > 
>> *************************************************************************** 
>> >> > 
>> >> > IPython post-mortem report 
>> >> > 
>> >> > {'commit_hash': u'b467d487e', 
>> >> >  'commit_source': 'installation', 
>> >> >  'default_encoding': 'UTF-8', 
>> >> >  'ipython_path': '/usr/lib/python2.7/dist-packages/IPython', 
>> >> >  'ipython_version': '5.5.0', 
>> >> >  'os_name': 'posix', 
>> >> >  'platform': 
>> 'Linux-5.3.0-40-generic-x86_64-with-LinuxMint-19.3-tricia', 
>> >> >  'sys_executable': '/usr/bin/python', 
>> >> >  'sys_platform': 'linux2', 
>> >> >  'sys_version': '2.7.17 (default, Nov  7 2019, 10:07:09) \n[GCC 
>> 7.4.0]'} 
>> >> > 
>> >> > 
>> *************************************************************************** 
>> >> > 
>> >> > 
>> >> > 
>> >> > 
>> *************************************************************************** 
>> >> > 
>> >> > Crash traceback: 
>> >> > 
>> >> > 
>> --------------------------------------------------------------------------- 
>> >> > 
>> --------------------------------------------------------------------------- 
>> >> > ImportError                                  Python 2.7.17: 
>> /usr/bin/python 
>> >> >                                                    Sat Apr  4 
>> 18:39:09 2020 
>> >> > A problem occurred executing Python code.  Here is the sequence of 
>> function 
>> >> > calls leading up to the error, with the most recent (innermost) call 
>> last. 
>> >> > /usr/share/sagemath/bin/sage-ipython in <module>() 
>> >> >       1 #!/usr/bin/env python 
>> >> >       2 # -*- coding: utf-8 -*- 
>> >> >       3 """ 
>> >> >       4 Sage IPython startup script. 
>> >> >       5 """ 
>> >> >       6 
>> >> >       7 from sage.repl.interpreter import SageTerminalApp 
>> >> >       8 
>> >> >       9 app = SageTerminalApp.instance() 
>> >> > ---> 10 app.initialize() 
>> >> >         global app.initialize = <bound method 
>> SageTerminalApp.initialize of <sage.repl.interpreter.SageTerminalApp object 
>> at 0x7f76836e7150>> 
>> >> >      11 app.start() 
>> >> > 
>> >> > <decorator-gen-110> in 
>> initialize(self=<sage.repl.interpreter.SageTerminalApp object>, argv=None) 
>> >> > 
>> >> > /usr/lib/python2.7/dist-packages/traitlets/config/application.pyc in 
>> catch_config_error(method=<function initialize>, 
>> app=<sage.repl.interpreter.SageTerminalApp object>, *args=(None,), 
>> **kwargs={}) 
>> >> >      72     TRAITLETS_APPLICATION_RAISE_CONFIG_FILE_ERROR = False 
>> >> >      73 else: 
>> >> >      74     raise ValueError("Unsupported value for environment 
>> variable: 'TRAITLETS_APPLICATION_RAISE_CONFIG_FILE_ERROR' is set to '%s' 
>> which is none of  {'0', '1', 'false', 'true', ''}."% _envvar ) 
>> >> >      75 
>> >> >      76 
>> >> >      77 @decorator 
>> >> >      78 def catch_config_error(method, app, *args, **kwargs): 
>> >> >      79     """Method decorator for catching invalid config 
>> (Trait/ArgumentErrors) during init. 
>> >> >      80 
>> >> >      81     On a TraitError (generally caused by bad config), this 
>> will print the trait's 
>> >> >      82     message, and exit the app. 
>> >> >      83 
>> >> >      84     For use on init methods, to prevent invoking excepthook 
>> on invalid input. 
>> >> >      85     """ 
>> >> >      86     try: 
>> >> > ---> 87         return method(app, *args, **kwargs) 
>> >> >         method = <function initialize at 0x7f76806919d0> 
>> >> >         app = <sage.repl.interpreter.SageTerminalApp object at 
>> 0x7f76836e7150> 
>> >> >         args = (None,) 
>> >> >         kwargs = {} 
>> >> >      88     except (TraitError, ArgumentError) as e: 
>> >> >      89         app.print_help() 
>> >> >      90         app.log.fatal("Bad config encountered during 
>> initialization:") 
>> >> >      91         app.log.fatal(str(e)) 
>> >> >      92         app.log.debug("Config at the time: %s", app.config) 
>> >> >      93         app.exit(1) 
>> >> >      94 
>> >> >      95 
>> >> >      96 class ApplicationError(Exception): 
>> >> >      97     pass 
>> >> >      98 
>> >> >      99 
>> >> >     100 class LevelFormatter(logging.Formatter): 
>> >> >     101     """Formatter with additional `highlevel` record 
>> >> >     102 
>> >> > 
>> >> > /usr/lib/python2.7/dist-packages/IPython/terminal/ipapp.pyc in 
>> initialize(self=<sage.repl.interpreter.SageTerminalApp object>, argv=None) 
>> >> >     301 
>> >> >     302         return super(TerminalIPythonApp, 
>> self).parse_command_line(argv) 
>> >> >     303 
>> >> >     304     @catch_config_error 
>> >> >     305     def initialize(self, argv=None): 
>> >> >     306         """Do actions after construct, but before starting 
>> the app.""" 
>> >> >     307         super(TerminalIPythonApp, self).initialize(argv) 
>> >> >     308         if self.subapp is not None: 
>> >> >     309             # don't bother initializing further, starting 
>> subapp 
>> >> >     310             return 
>> >> >     311         # print self.extra_args 
>> >> >     312         if self.extra_args and not self.something_to_run: 
>> >> >     313             self.file_to_run = self.extra_args[0] 
>> >> >     314         self.init_path() 
>> >> >     315         # create the shell 
>> >> > --> 316         self.init_shell() 
>> >> >         self.init_shell = <bound method SageTerminalApp.init_shell 
>> of <sage.repl.interpreter.SageTerminalApp object at 0x7f76836e7150>> 
>> >> >     317         # and draw the banner 
>> >> >     318         self.init_banner() 
>> >> >     319         # Now a variety of things that happen after the 
>> banner is printed. 
>> >> >     320         self.init_gui_pylab() 
>> >> >     321         self.init_extensions() 
>> >> >     322         self.init_code() 
>> >> >     323 
>> >> >     324     def init_shell(self): 
>> >> >     325         """initialize the InteractiveShell instance""" 
>> >> >     326         # Create an InteractiveShell instance. 
>> >> >     327         # shell.display_banner should always be False for 
>> the terminal 
>> >> >     328         # based app, because we call shell.show_banner() by 
>> hand below 
>> >> >     329         # so the banner shows *before* all extension loading 
>> stuff. 
>> >> >     330         self.shell = 
>> self.interactive_shell_class.instance(parent=self, 
>> >> >     331                         profile_dir=self.profile_dir, 
>> >> > 
>> >> > /usr/lib/python2.7/dist-packages/sage/repl/interpreter.pyc in 
>> init_shell(self=<sage.repl.interpreter.SageTerminalApp object>) 
>> >> >     730             This code is based on 
>> >> >     731             :meth:`TerminalIPythonApp.init_shell`. 
>> >> >     732 
>> >> >     733         EXAMPLES:: 
>> >> >     734 
>> >> >     735             sage: from sage.repl.interpreter import 
>> SageTerminalApp 
>> >> >     736             sage: app = SageTerminalApp.instance() 
>> >> >     737             sage: app.shell 
>> >> >     738             <sage.repl.interpreter.SageTestShell object at 
>> 0x...> 
>> >> >     739         """ 
>> >> >     740         # Shell initialization 
>> >> >     741         self.shell = self.shell_class.instance( 
>> >> >     742             parent=self, 
>> >> >     743             config=self.config, 
>> >> >     744             profile_dir=self.profile_dir, 
>> >> > --> 745             ipython_dir=self.ipython_dir) 
>> >> >         global ipython_dir = undefined 
>> >> >         self.ipython_dir = u'/home/lmiller/.ipython' 
>> >> >     746         self.shell.configurables.append(self) 
>> >> >     747         self.shell.has_sage_extensions = SAGE_EXTENSION in 
>> self.extensions 
>> >> >     748 
>> >> >     749         # Load the %lprun extension if available 
>> >> >     750         try: 
>> >> >     751             import line_profiler 
>> >> >     752         except ImportError: 
>> >> >     753             pass 
>> >> >     754         else: 
>> >> >     755             self.extensions.append('line_profiler') 
>> >> >     756 
>> >> >     757         if self.shell.has_sage_extensions: 
>> >> >     758             self.extensions.remove(SAGE_EXTENSION) 
>> >> >     759 
>> >> >     760             # load sage extension here to get a crash if 
>> >> > 
>> >> > /usr/lib/python2.7/dist-packages/traitlets/config/configurable.pyc 
>> in instance(cls=<class 
>> 'sage.repl.interpreter.SageTerminalInteractiveShell'>, *args=(), 
>> **kwargs={'config': {'InteractiveShell': {'term_title': True, 'color...ue}, 
>> 'SageTerminalApp': {'force_interact': True}}, 'ipython_dir': 
>> u'/home/lmiller/.ipython', 'parent': <sage.repl.interpreter.SageTerminalApp 
>> object>, 'profile_dir': <IPython.core.profiledir.ProfileDir object>}) 
>> >> >     397             >>> class Foo(SingletonConfigurable): pass 
>> >> >     398             >>> foo = Foo.instance() 
>> >> >     399             >>> foo == Foo.instance() 
>> >> >     400             True 
>> >> >     401 
>> >> >     402         Create a subclass that is retrived using the base 
>> class instance:: 
>> >> >     403 
>> >> >     404             >>> class Bar(SingletonConfigurable): pass 
>> >> >     405             >>> class Bam(Bar): pass 
>> >> >     406             >>> bam = Bam.instance() 
>> >> >     407             >>> bam == Bar.instance() 
>> >> >     408             True 
>> >> >     409         """ 
>> >> >     410         # Create and save the instance 
>> >> >     411         if cls._instance is None: 
>> >> > --> 412             inst = cls(*args, **kwargs) 
>> >> >         inst = undefined 
>> >> >         cls = <class 
>> 'sage.repl.interpreter.SageTerminalInteractiveShell'> 
>> >> >         args = () 
>> >> >         kwargs = {'ipython_dir': u'/home/lmiller/.ipython', 
>> 'profile_dir': <IPython.core.profiledir.ProfileDir object at 
>> 0x7f76806b4d50>, 'config': {'InteractiveShell': {'term_title': True, 
>> 'colors': 'LightBG', 'confirm_exit': False, 'prompts_class': <class 
>> 'sage.repl.prompts.SagePrompts'>, 'separate_in': '', 
>> 'ast_node_interactivity': 'all', 'simple_prompt': False}, 
>> 'InteractiveShellApp': {'extensions': ['sage']}, 'TerminalIPythonApp': 
>> {'shell_class': <class 
>> 'sage.repl.interpreter.SageTerminalInteractiveShell'>, 'display_banner': 
>> False, 'test_shell': False, 'verbose_crash': True}, 'SageTerminalApp': 
>> {'force_interact': True}}, 'parent': <sage.repl.interpreter.SageTerminalApp 
>> object at 0x7f76836e7150>} 
>> >> >     413             # Now make sure that the instance will also be 
>> returned by 
>> >> >     414             # parent classes' _instance attribute. 
>> >> >     415             for subclass in cls._walk_mro(): 
>> >> >     416                 subclass._instance = inst 
>> >> >     417 
>> >> >     418         if isinstance(cls._instance, cls): 
>> >> >     419             return cls._instance 
>> >> >     420         else: 
>> >> >     421             raise MultipleInstanceError( 
>> >> >     422                 'Multiple incompatible subclass instances of 
>> ' 
>> >> >     423                 '%s are being created.' % cls.__name__ 
>> >> >     424             ) 
>> >> >     425 
>> >> >     426     @classmethod 
>> >> >     427     def initialized(cls): 
>> >> > 
>> >> > 
>> /usr/lib/python2.7/dist-packages/IPython/terminal/interactiveshell.pyc in 
>> __init__(self=<sage.repl.interpreter.SageTerminalInteractiveShell object>, 
>> *args=(), **kwargs={'config': {'InteractiveShell': {'term_title': True, 
>> 'color...ue}, 'SageTerminalApp': {'force_interact': True}}, 'ipython_dir': 
>> u'/home/lmiller/.ipython', 'parent': <sage.repl.interpreter.SageTerminalApp 
>> object>, 'profile_dir': <IPython.core.profiledir.ProfileDir object>}) 
>> >> >     423 
>> >> >     424     def init_alias(self): 
>> >> >     425         # The parent class defines aliases that can be 
>> safely used with any 
>> >> >     426         # frontend. 
>> >> >     427         super(TerminalInteractiveShell, self).init_alias() 
>> >> >     428 
>> >> >     429         # Now define aliases that only make sense on the 
>> terminal, because they 
>> >> >     430         # need direct access to the console in a way that we 
>> can't emulate in 
>> >> >     431         # GUI or web frontend 
>> >> >     432         if os.name == 'posix': 
>> >> >     433             for cmd in ['clear', 'more', 'less', 'man']: 
>> >> >     434                 self.alias_manager.soft_define_alias(cmd, 
>> cmd) 
>> >> >     435 
>> >> >     436 
>> >> >     437     def __init__(self, *args, **kwargs): 
>> >> > --> 438         super(TerminalInteractiveShell, 
>> self).__init__(*args, **kwargs) 
>> >> >         global super = undefined 
>> >> >         global TerminalInteractiveShell = <class 
>> 'IPython.terminal.interactiveshell.TerminalInteractiveShell'> 
>> >> >         self.__init__ = <bound method 
>> SageTerminalInteractiveShell.__init__ of 
>> <sage.repl.interpreter.SageTerminalInteractiveShell object at 
>> 0x7f76806b4910>> 
>> >> >         args = () 
>> >> >         kwargs = {'profile_dir': <IPython.core.profiledir.ProfileDir 
>> object at 0x7f76806b4d50>, 'config': {'InteractiveShell': {'term_title': 
>> True, 'colors': 'LightBG', 'confirm_exit': False, 'prompts_class': <class 
>> 'sage.repl.prompts.SagePrompts'>, 'separate_in': '', 
>> 'ast_node_interactivity': 'all', 'simple_prompt': False}, 
>> 'InteractiveShellApp': {'extensions': ['sage']}, 'TerminalIPythonApp': 
>> {'shell_class': <class 
>> 'sage.repl.interpreter.SageTerminalInteractiveShell'>, 'display_banner': 
>> False, 'test_shell': False, 'verbose_crash': True}, 'SageTerminalApp': 
>> {'force_interact': True}}, 'ipython_dir': u'/home/lmiller/.ipython', 
>> 'parent': <sage.repl.interpreter.SageTerminalApp object at 0x7f76836e7150>} 
>> >> >     439         self.init_prompt_toolkit_cli() 
>> >> >     440         self.init_term_title() 
>> >> >     441         self.keep_running = True 
>> >> >     442 
>> >> >     443         self.debugger_history = InMemoryHistory() 
>> >> >     444 
>> >> >     445     def ask_exit(self): 
>> >> >     446         self.keep_running = False 
>> >> >     447 
>> >> >     448     rl_next_input = None 
>> >> >     449 
>> >> >     450     def pre_prompt(self): 
>> >> >     451         if self.rl_next_input: 
>> >> >     452             # We can't set the buffer here, because it will 
>> be reset just after 
>> >> >     453             # this. Adding a callable to pre_run_callables 
>> does what we need 
>> >> > 
>> >> > /usr/lib/python2.7/dist-packages/IPython/core/interactiveshell.pyc 
>> in __init__(self=<sage.repl.interpreter.SageTerminalInteractiveShell 
>> object>, ipython_dir=u'/home/lmiller/.ipython', 
>> profile_dir=<IPython.core.profiledir.ProfileDir object>, user_module=None, 
>> user_ns=None, custom_exceptions=((), None), **kwargs={'config': 
>> {'InteractiveShell': {'term_title': True, 'color...ue}, 'SageTerminalApp': 
>> {'force_interact': True}}, 'parent': <sage.repl.interpreter.SageTerminalApp 
>> object>}) 
>> >> >     488         self.init_builtins() 
>> >> >     489 
>> >> >     490         # The following was in post_config_initialization 
>> >> >     491         self.init_inspector() 
>> >> >     492         if py3compat.PY3: 
>> >> >     493             self.raw_input_original = input 
>> >> >     494         else: 
>> >> >     495             self.raw_input_original = raw_input 
>> >> >     496         self.init_completer() 
>> >> >     497         # TODO: init_io() needs to happen before 
>> init_traceback handlers 
>> >> >     498         # because the traceback handlers hardcode the 
>> stdout/stderr streams. 
>> >> >     499         # This logic in in debugger.Pdb and should 
>> eventually be changed. 
>> >> >     500         self.init_io() 
>> >> >     501         self.init_traceback_handlers(custom_exceptions) 
>> >> >     502         self.init_prompts() 
>> >> > --> 503         self.init_display_formatter() 
>> >> >         self.init_display_formatter = <bound method 
>> SageTerminalInteractiveShell.init_display_formatter of 
>> <sage.repl.interpreter.SageTerminalInteractiveShell object at 
>> 0x7f76806b4910>> 
>> >> >     504         self.init_display_pub() 
>> >> >     505         self.init_data_pub() 
>> >> >     506         self.init_displayhook() 
>> >> >     507         self.init_magics() 
>> >> >     508         self.init_alias() 
>> >> >     509         self.init_logstart() 
>> >> >     510         self.init_pdb() 
>> >> >     511         self.init_extension_manager() 
>> >> >     512         self.init_payload() 
>> >> >     513         self.init_deprecation_warnings() 
>> >> >     514         self.hooks.late_startup_hook() 
>> >> >     515         self.events.trigger('shell_initialized', self) 
>> >> >     516         atexit.register(self.atexit_operations) 
>> >> >     517 
>> >> >     518     def get_ipython(self): 
>> >> > 
>> >> > /usr/lib/python2.7/dist-packages/sage/repl/interpreter.pyc in 
>> init_display_formatter(self=<sage.repl.interpreter.SageTerminalInteractiveShell
>>  
>> object>) 
>> >> >     245 
>> >> >     246         sage: from sage.repl.interpreter import 
>> SageTerminalInteractiveShell 
>> >> >     247         sage: SageTerminalInteractiveShell()   # not tested 
>> >> >     248         <sage.repl.interpreter.SageNotebookInteractiveShell 
>> object at 0x...> 
>> >> >     249     """ 
>> >> >     250 
>> >> >     251     def init_display_formatter(self): 
>> >> >     252         """ 
>> >> >     253         Switch to the Sage IPython commandline rich output 
>> backend 
>> >> >     254 
>> >> >     255         EXAMPLES:: 
>> >> >     256 
>> >> >     257             sage: from sage.repl.interpreter import 
>> SageTerminalInteractiveShell 
>> >> >     258             sage: 
>> SageTerminalInteractiveShell().init_display_formatter()   # not tested 
>> >> >     259         """ 
>> >> > --> 260         from sage.repl.rich_output.backend_ipython import 
>> BackendIPythonCommandline 
>> >> >         global sage.repl.rich_output.backend_ipython = undefined 
>> >> >         BackendIPythonCommandline = undefined 
>> >> >     261         backend = BackendIPythonCommandline() 
>> >> >     262         
>> backend.get_display_manager().switch_backend(backend, shell=self) 
>> >> >     263 
>> >> >     264 
>> >> >     265 class SageTestShell(SageShellOverride, 
>> TerminalInteractiveShell): 
>> >> >     266     """ 
>> >> >     267     Test Shell 
>> >> >     268 
>> >> >     269     Care must be taken in these doctests to quit the test 
>> shell in 
>> >> >     270     order to switch back the rich output display backend to 
>> the 
>> >> >     271     doctest backend. 
>> >> >     272 
>> >> >     273     EXAMPLES:: 
>> >> >     274 
>> >> >     275         sage: from sage.repl.interpreter import 
>> get_test_shell 
>> >> > 
>> >> > /usr/lib/python2.7/dist-packages/sage/repl/rich_output/__init__.py 
>> in <module>() 
>> >> >       1 # -*- encoding: utf-8 -*- 
>> >> >       2 
>> >> > ----> 3 from .display_manager import get_display_manager 
>> >> >         global display_manager = undefined 
>> >> >         global get_display_manager = undefined 
>> >> >       4 from .pretty_print import pretty_print 
>> >> >       5 
>> >> >       6 
>> >> > 
>> >> > 
>> /usr/lib/python2.7/dist-packages/sage/repl/rich_output/display_manager.py 
>> in <module>() 
>> >> >      24     The Sage display manager using the doctest backend 
>> >> >      25 """ 
>> >> >      26 
>> >> >      27 
>> #*****************************************************************************
>>  
>>
>> >> >      28 #       Copyright (C) 2015 Volker Braun <vbrau...@gmail.com> 
>>
>> >> >      29 # 
>> >> >      30 #  Distributed under the terms of the GNU General Public 
>> License (GPL) 
>> >> >      31 #  as published by the Free Software Foundation; either 
>> version 2 of 
>> >> >      32 #  the License, or (at your option) any later version. 
>> >> >      33 #                  http://www.gnu.org/licenses/ 
>> >> >      34 
>> #*****************************************************************************
>>  
>>
>> >> >      35 
>> >> >      36 
>> >> >      37 import warnings 
>> >> >      38 
>> >> > ---> 39 from sage.structure.sage_object import SageObject 
>> >> >         global sage.structure.sage_object = undefined 
>> >> >         global SageObject = undefined 
>> >> >      40 from sage.repl.rich_output.output_basic import ( 
>> >> >      41     OutputPlainText, OutputAsciiArt, OutputUnicodeArt, 
>> OutputLatex, 
>> >> >      42 ) 
>> >> >      43 from sage.repl.rich_output.preferences import 
>> DisplayPreferences 
>> >> >      44 
>> >> >      45 
>> >> >      46 class DisplayException(Exception): 
>> >> >      47     """ 
>> >> >      48     Base exception for all rich output-related exceptions. 
>> >> >      49 
>> >> >      50     EXAMPLES:: 
>> >> >      51 
>> >> >      52         sage: from sage.repl.rich_output.display_manager 
>> import DisplayException 
>> >> >      53         sage: raise DisplayException('foo') 
>> >> >      54         Traceback (most recent call last): 
>> >> > 
>> >> > ImportError: No module named sage_object 
>> >> > 
>> >> > 
>> *************************************************************************** 
>> >> > 
>> >> > -- 
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>>  
>>
>> > 
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>>  
>>
>>
>

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