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r""" 

Sage's IPython Modifications 

 

This module contains all of Sage's customizations to the IPython 

interpreter. These changes consist of the following major components: 

 

- :class:`SageTerminalApp` 

- :class:`SageInteractiveShell` 

- :class:`SageTerminalInteractiveShell` 

- :func:`interface_shell_embed` 

 

SageTerminalApp 

--------------- 

 

This is the main application object. It is used by the 

``$SAGE_LOCAL/bin/sage-ipython`` script to start the Sage 

command-line. It's primary purpose is to 

 

- Initialize the :class:`SageTerminalInteractiveShell`. 

 

- Provide default configuration options for the shell, and its 

subcomponents. These work with (and can be overridden by) 

IPython's configuration system. 

 

- Load the Sage ipython extension (which does things like preparsing, 

add magics, etc.). 

 

- Provide a custom :class:`SageCrashHandler` to give the user 

instructions on how to report the crash to the Sage support 

mailing list. 

 

SageInteractiveShell 

-------------------- 

 

The :class:`SageInteractiveShell` object is the object responsible for 

accepting input from the user and evaluating it. From the command-line, 

this object can be retrieved by running:: 

 

sage: shell = get_ipython() # not tested 

 

Any input is preprocessed and evaluated inside the ``shell.run_cell`` 

method. If the command line processing does not do what you want it to 

do, you can step through it in the debugger:: 

 

sage: %debug shell.run_cell('?') # not tested 

 

The :class:`SageInteractiveShell` provides the following 

customizations: 

 

- Modify the libraries before calling system commands. See 

:meth:`~SageInteractiveShell.system_raw`. 

 

SageTerminalInteractiveShell 

---------------------------- 

 

The :class:`SageTerminalInteractiveShell` is a close relative of 

:class:`SageInteractiveShell` that is specialized for running in a 

terminal. In particular, running commands like ``!ls`` will directly 

write to stdout. Technically, the ``system`` attribute will point to 

``system_raw`` instead of ``system_piped``. 

 

Interface Shell 

--------------- 

 

The function :func:`interface_shell_embed` takes a 

:class:`~sage.interfaces.interface.Interface` object and returns an 

embeddable IPython shell which can be used to directly interact with 

that shell. The bulk of this functionality is provided through 

:class:`InterfaceShellTransformer`. 

 

TESTS: 

 

Check that Cython source code appears in tracebacks:: 

 

sage: from sage.repl.interpreter import get_test_shell 

sage: shell = get_test_shell() 

sage: shell.run_cell('1/0') 

--------------------------------------------------------------------------- 

ZeroDivisionError Traceback (most recent call last) 

<ipython-input-...> in <module>() 

----> 1 Integer(1)/Integer(0) 

<BLANKLINE> 

.../sage/rings/integer.pyx in sage.rings.integer.Integer.__div__ (.../cythonized/sage/rings/integer.c:...)() 

....: if type(left) is type(right): 

....: if mpz_sgn((<Integer>right).value) == 0: 

-> ... raise ZeroDivisionError("rational division by zero") 

....: x = <Rational> Rational.__new__(Rational) 

....: mpq_div_zz(x.value, (<Integer>left).value, (<Integer>right).value) 

<BLANKLINE> 

ZeroDivisionError: rational division by zero 

sage: shell.quit() 

""" 

 

#***************************************************************************** 

# Copyright (C) 2004-2012 William Stein <wstein@gmail.com> 

# 

# This program is free software: you can redistribute it and/or modify 

# it under the terms of the GNU General Public License as published by 

# the Free Software Foundation, either version 2 of the License, or 

# (at your option) any later version. 

# http://www.gnu.org/licenses/ 

#***************************************************************************** 

 

 

import os 

import re 

from sage.repl.preparse import preparse 

from sage.repl.prompts import SagePrompts, InterfacePrompts 

 

from traitlets import Bool, Type 

 

from sage.env import SAGE_LOCAL 

from sage.repl.configuration import sage_ipython_config, SAGE_EXTENSION 

 

def embedded(): 

""" 

Returns True if Sage is being run from the notebook. 

 

EXAMPLES:: 

 

sage: from sage.repl.interpreter import embedded 

sage: embedded() 

False 

""" 

import sage.server.support 

return sage.server.support.EMBEDDED_MODE 

 

#TODO: This global variable do_preparse should be associated with an 

#IPython InteractiveShell as opposed to a global variable in this 

#module. 

_do_preparse=True 

def preparser(on=True): 

""" 

Turn on or off the Sage preparser. 

 

:keyword on: if True turn on preparsing; if False, turn it off. 

:type on: bool 

 

EXAMPLES:: 

 

sage: 2/3 

2/3 

sage: preparser(False) 

sage: 2/3 # not tested since doctests are always preparsed 

0 

sage: preparser(True) 

sage: 2^3 

8 

""" 

global _do_preparse 

_do_preparse = on is True 

 

############################## 

# Sage[Terminal]InteractiveShell # 

############################## 

class SageShellOverride(object): 

""" 

Mixin to override methods in IPython's [Terminal]InteractiveShell 

classes. 

""" 

 

def show_usage(self): 

""" 

Print the basic Sage usage. 

 

This method ends up being called when you enter ``?`` and 

nothing else on the command line. 

 

EXAMPLES:: 

 

sage: from sage.repl.interpreter import get_test_shell 

sage: shell = get_test_shell() 

sage: shell.run_cell('?') 

Welcome to Sage ... 

sage: shell.quit() 

""" 

from sage.misc.sagedoc import help 

help() 

 

def system_raw(self, cmd): 

""" 

Run a system command. 

 

This is equivalent to the sage-native-execute shell script. 

 

EXAMPLES:: 

 

sage: from sage.repl.interpreter import get_test_shell 

sage: shell = get_test_shell() 

sage: shell.system_raw('false') 

sage: shell.user_ns['_exit_code'] > 0 

True 

sage: shell.system_raw('true') 

sage: shell.user_ns['_exit_code'] 

0 

sage: shell.system_raw('R --version') 

R version ... 

sage: shell.user_ns['_exit_code'] 

0 

sage: shell.quit() 

""" 

return super(SageShellOverride, self).system_raw(cmd) 

 

 

from IPython.core.interactiveshell import InteractiveShell 

from IPython.terminal.interactiveshell import TerminalInteractiveShell 

 

 

class SageNotebookInteractiveShell(SageShellOverride, InteractiveShell): 

""" 

IPython Shell for the Sage IPython Notebook 

 

The doctests are not tested since they would change the current 

rich output backend away from the doctest rich output backend. 

 

EXAMPLES:: 

 

sage: from sage.repl.interpreter import SageNotebookInteractiveShell 

sage: SageNotebookInteractiveShell() # not tested 

<sage.repl.interpreter.SageNotebookInteractiveShell object at 0x...> 

""" 

 

def init_display_formatter(self): 

""" 

Switch to the Sage IPython notebook rich output backend 

 

EXAMPLES:: 

 

sage: from sage.repl.interpreter import SageNotebookInteractiveShell 

sage: SageNotebookInteractiveShell().init_display_formatter() # not tested 

""" 

from sage.repl.rich_output.backend_ipython import BackendIPythonNotebook 

backend = BackendIPythonNotebook() 

backend.get_display_manager().switch_backend(backend, shell=self) 

 

 

class SageTerminalInteractiveShell(SageShellOverride, TerminalInteractiveShell): 

""" 

IPython Shell for the Sage IPython Commandline Interface 

 

The doctests are not tested since they would change the current 

rich output backend away from the doctest rich output backend. 

 

EXAMPLES:: 

 

sage: from sage.repl.interpreter import SageTerminalInteractiveShell 

sage: SageTerminalInteractiveShell() # not tested 

<sage.repl.interpreter.SageNotebookInteractiveShell object at 0x...> 

""" 

 

def init_display_formatter(self): 

""" 

Switch to the Sage IPython commandline rich output backend 

 

EXAMPLES:: 

 

sage: from sage.repl.interpreter import SageTerminalInteractiveShell 

sage: SageTerminalInteractiveShell().init_display_formatter() # not tested 

""" 

from sage.repl.rich_output.backend_ipython import BackendIPythonCommandline 

backend = BackendIPythonCommandline() 

backend.get_display_manager().switch_backend(backend, shell=self) 

 

 

class SageTestShell(SageShellOverride, TerminalInteractiveShell): 

""" 

Test Shell 

 

Care must be taken in these doctests to quit the test shell in 

order to switch back the rich output display backend to the 

doctest backend. 

 

EXAMPLES:: 

 

sage: from sage.repl.interpreter import get_test_shell 

sage: shell = get_test_shell(); shell 

<sage.repl.interpreter.SageTestShell object at 0x...> 

sage: shell.quit() 

""" 

 

def init_display_formatter(self): 

""" 

Switch to the Sage IPython commandline rich output backend 

 

EXAMPLES:: 

 

sage: from sage.repl.interpreter import get_test_shell 

sage: shell = get_test_shell(); shell 

<sage.repl.interpreter.SageTestShell object at 0x...> 

sage: shell.quit() 

sage: shell.init_display_formatter() 

sage: shell.quit() 

""" 

from sage.repl.rich_output.backend_ipython import BackendIPythonCommandline 

self._ipython_backend = backend = BackendIPythonCommandline() 

self._display_manager = backend.get_display_manager() 

self._doctest_backend = self._display_manager.switch_backend(backend, shell=self) 

 

def quit(self): 

""" 

Quit the test shell. 

 

To make the test shell as realistic as possible, we switch to 

the 

:class:`~sage.repl.rich_output.backend_ipython.BackendIPythonCommandline` 

display backend. This method restores the previous display 

backend, which is the 

:class:`~sage.repl.rich_output.backend_doctest.BackendDoctest` 

during doctests. 

 

EXAMPLES:: 

 

sage: from sage.repl.interpreter import get_test_shell 

sage: from sage.repl.rich_output import get_display_manager 

sage: get_display_manager() 

The Sage display manager using the doctest backend 

 

sage: shell = get_test_shell() 

sage: get_display_manager() 

The Sage display manager using the IPython command line backend 

 

sage: shell.quit() 

sage: get_display_manager() 

The Sage display manager using the doctest backend 

""" 

self._display_manager.switch_backend(self._doctest_backend) 

 

def _restart(self): 

""" 

Restart the test shell (after :meth:`quit`). 

 

EXAMPLES:: 

 

sage: from sage.repl.interpreter import get_test_shell 

sage: shell = get_test_shell() 

sage: shell.quit() 

sage: shell._restart() 

sage: shell.quit() 

sage: from sage.repl.rich_output import get_display_manager 

sage: get_display_manager() 

The Sage display manager using the doctest backend 

""" 

self._display_manager.switch_backend(self._ipython_backend, shell=self) 

 

def run_cell(self, *args, **kwds): 

""" 

Run IPython cell 

 

Starting with IPython-3.0, this returns an success/failure 

information. Since it is more convenient for doctests, we 

ignore it. 

 

 

EXAMPLES:: 

 

sage: from sage.repl.interpreter import get_test_shell 

sage: shell = get_test_shell() 

sage: rc = shell.run_cell('1/0') 

--------------------------------------------------------------------------- 

ZeroDivisionError Traceback (most recent call last) 

... 

ZeroDivisionError: rational division by zero 

sage: rc is None 

True 

sage: shell.quit() 

""" 

rc = super(SageTestShell, self).run_cell(*args, **kwds) 

 

 

 

################################################################### 

# Transformers used in the SageInputSplitter 

################################################################### 

from IPython.core.inputtransformer import (CoroutineInputTransformer, 

StatelessInputTransformer, 

_strip_prompts) 

 

@StatelessInputTransformer.wrap 

def SagePreparseTransformer(line): 

r""" 

EXAMPLES:: 

 

sage: from sage.repl.interpreter import SagePreparseTransformer 

sage: spt = SagePreparseTransformer() 

sage: spt.push('1+1r+2.3^2.3r') 

"Integer(1)+1+RealNumber('2.3')**2.3" 

sage: preparser(False) 

sage: spt.push('2.3^2') 

'2.3^2' 

 

TESTS: 

 

Check that syntax errors in the preparser do not crash IPython, 

see :trac:`14961`. :: 

 

sage: preparser(True) 

sage: bad_syntax = "R.<t> = QQ{]" 

sage: preparse(bad_syntax) 

Traceback (most recent call last): 

... 

SyntaxError: Mismatched ']' 

sage: from sage.repl.interpreter import get_test_shell 

sage: shell = get_test_shell() 

sage: shell.run_cell(bad_syntax) 

File "<string>", line unknown 

SyntaxError: Mismatched ']' 

<BLANKLINE> 

sage: shell.quit() 

""" 

if _do_preparse and not line.startswith('%'): 

return preparse(line) 

else: 

return line 

 

@CoroutineInputTransformer.wrap 

def SagePromptTransformer(): 

r""" 

Strip the sage:/....: prompts of Sage. 

 

EXAMPLES:: 

 

sage: from sage.repl.interpreter import SagePromptTransformer 

sage: spt = SagePromptTransformer() 

sage: spt.push("sage: 2 + 2") 

'2 + 2' 

sage: spt.push('') 

'' 

sage: spt.push("....: 2+2") 

'2+2' 

 

This should strip multiple prompts: see :trac:`16297`:: 

 

sage: spt.push("sage: sage: 2+2") 

'2+2' 

sage: spt.push(" sage: ....: 2+2") 

'2+2' 

 

The prompt contains a trailing space. Extra spaces between the 

last prompt and the remainder should not be stripped:: 

 

sage: spt.push(" sage: ....: 2+2") 

' 2+2' 

 

We test that the input transformer is enabled on the Sage command 

line:: 

 

sage: from sage.repl.interpreter import get_test_shell 

sage: shell = get_test_shell() 

sage: shell.run_cell('sage: a = 123') # single line 

sage: shell.run_cell('sage: a = [\n... 123]') # old-style multi-line 

sage: shell.run_cell('sage: a = [\n....: 123]') # new-style multi-line 

 

We test that :trac:`16196` is resolved:: 

 

sage: shell.run_cell(' sage: 1+1') 

2 

sage: shell.quit() 

""" 

_sage_prompt_re = re.compile(r'^(\s*(:?sage: |\.\.\.\.: ))+') 

return _strip_prompts(_sage_prompt_re) 

 

################### 

# Interface shell # 

################### 

from IPython.core.prefilter import PrefilterTransformer 

from IPython.terminal.embed import InteractiveShellEmbed 

 

class InterfaceShellTransformer(PrefilterTransformer): 

priority = 50 

def __init__(self, *args, **kwds): 

""" 

Initialize this class. All of the arguments get passed to 

:meth:`PrefilterTransformer.__init__`. 

 

.. attribute:: temporary_objects 

 

a list of hold onto interface objects and keep them from being 

garbage collected 

 

.. SEEALSO:: :func:`interface_shell_embed` 

 

EXAMPLES:: 

 

sage: from sage.repl.interpreter import interface_shell_embed 

sage: shell = interface_shell_embed(maxima) 

sage: ift = shell.prefilter_manager.transformers[0] 

sage: ift.temporary_objects 

set() 

sage: ift._sage_import_re.findall('sage(a) + maxima(b)') 

['a', 'b'] 

""" 

super(InterfaceShellTransformer, self).__init__(*args, **kwds) 

self.temporary_objects = set() 

self._sage_import_re = re.compile(r'(?:sage|%s)\((.*?)\)'%self.shell.interface.name()) 

 

def preparse_imports_from_sage(self, line): 

""" 

Finds occurrences of strings such as ``sage(object)`` in 

*line*, converts ``object`` to :attr:`shell.interface`, 

and replaces those strings with their identifier in the new 

system. This also works with strings such as 

``maxima(object)`` if :attr:`shell.interface` is 

``maxima``. 

 

:param line: the line to transform 

:type line: string 

 

.. warning:: 

 

This does not parse nested parentheses correctly. Thus, 

lines like ``sage(a.foo())`` will not work correctly. 

This can't be done in generality with regular expressions. 

 

EXAMPLES:: 

 

sage: from sage.repl.interpreter import interface_shell_embed, InterfaceShellTransformer 

sage: shell = interface_shell_embed(maxima) 

sage: ift = InterfaceShellTransformer(shell=shell, config=shell.config, prefilter_manager=shell.prefilter_manager) 

sage: ift.shell.ex('a = 3') 

sage: ift.preparse_imports_from_sage('2 + sage(a)') 

'2 + sage0 ' 

sage: maxima.eval('sage0') 

'3' 

sage: ift.preparse_imports_from_sage('2 + maxima(a)') # maxima calls set_seed on startup which is why 'sage0' will becomes 'sage4' and not just 'sage1' 

'2 + sage4 ' 

sage: ift.preparse_imports_from_sage('2 + gap(a)') 

'2 + gap(a)' 

""" 

for sage_code in self._sage_import_re.findall(line): 

expr = preparse(sage_code) 

result = self.shell.interface(eval(expr, self.shell.user_ns)) 

self.temporary_objects.add(result) 

line = self._sage_import_re.sub(' ' + result.name() + ' ', line, 1) 

return line 

 

def transform(self, line, continue_prompt): 

r''' 

Evaluates *line* in :attr:`shell.interface` and returns a 

string representing the result of that evaluation. 

 

:param line: the line to be transformed *and evaluated* 

:type line: string 

:param continue_prompt: is this line a continuation in a sequence of multiline input? 

:type continue_prompt: bool 

 

EXAMPLES:: 

 

sage: from sage.repl.interpreter import interface_shell_embed, InterfaceShellTransformer 

sage: shell = interface_shell_embed(maxima) 

sage: ift = InterfaceShellTransformer(shell=shell, config=shell.config, prefilter_manager=shell.prefilter_manager) 

sage: ift.transform('2+2', False) # note: output contains triple quotation marks 

'sage.misc.all.logstr("""4""")' 

sage: ift.shell.ex('a = 4') 

sage: ift.transform(r'sage(a)+4', False) 

'sage.misc.all.logstr("""8""")' 

sage: ift.temporary_objects 

set() 

sage: shell = interface_shell_embed(gap) 

sage: ift = InterfaceShellTransformer(shell=shell, config=shell.config, prefilter_manager=shell.prefilter_manager) 

sage: ift.transform('2+2', False) 

'sage.misc.all.logstr("""4""")' 

''' 

line = self.preparse_imports_from_sage(line) 

 

try: 

t = self.shell.interface.eval(line) 

finally: 

# Once we've evaluated the lines, we can clear the 

# temporary objects 

self.temporary_objects = set() 

return 'sage.misc.all.logstr("""%s""")'%t.strip() 

 

def interface_shell_embed(interface): 

""" 

Returns an IPython shell which uses a Sage interface on the 

backend to perform the evaluations. It uses 

:class:`InterfaceShellTransformer` to transform the input into the 

appropriate ``interface.eval(...)`` input. 

 

INPUT: 

 

- ``interface`` -- A Sage ``PExpect`` interface instance. 

 

EXAMPLES:: 

 

sage: from sage.repl.interpreter import interface_shell_embed 

sage: shell = interface_shell_embed(gap) 

sage: shell.run_cell('List( [1..10], IsPrime )') 

[ false, true, true, false, true, false, true, false, false, false ] 

<ExecutionResult object at ..., execution_count=None error_before_exec=None error_in_exec=None result=[ false, true, true, false, true, false, true, false, false, false ]> 

""" 

cfg = sage_ipython_config.copy() 

ipshell = InteractiveShellEmbed(config=cfg, 

banner1='\n --> Switching to %s <--\n\n'%interface, 

exit_msg='\n --> Exiting back to Sage <--\n') 

ipshell.interface = interface 

ipshell.prompts = InterfacePrompts(interface.name()) 

 

while ipshell.prefilter_manager.transformers: 

ipshell.prefilter_manager.transformers.pop() 

while ipshell.prefilter_manager.checkers: 

ipshell.prefilter_manager.checkers.pop() 

ipshell.ex('import sage.misc.all') 

 

InterfaceShellTransformer(shell=ipshell, 

prefilter_manager=ipshell.prefilter_manager, 

config=cfg) 

return ipshell 

 

def get_test_shell(): 

""" 

Returns a IPython shell that can be used in testing the functions 

in this module. 

 

OUTPUT: 

 

An IPython shell 

 

EXAMPLES:: 

 

sage: from sage.repl.interpreter import get_test_shell 

sage: shell = get_test_shell(); shell 

<sage.repl.interpreter.SageTestShell object at 0x...> 

sage: shell.parent.shell_class 

<class 'sage.repl.interpreter.SageTestShell'> 

sage: shell.parent.test_shell 

True 

sage: shell.quit() 

 

TESTS: 

 

Check that :trac:`14070` has been resolved:: 

 

sage: from sage.tests.cmdline import test_executable 

sage: cmd = 'from sage.repl.interpreter import get_test_shell; shell = get_test_shell()' 

sage: (out, err, ret) = test_executable(["sage", "-c", cmd]) 

sage: out + err 

'' 

""" 

config = sage_ipython_config.default() 

config.TerminalIPythonApp.test_shell = True 

config.TerminalIPythonApp.shell_class = SageTestShell 

app = SageTerminalApp.instance(config=config) 

if app.shell is None: 

app.initialize(argv=[]) 

else: 

try: 

app.shell._restart() 

except AttributeError: 

pass 

# No quit noise 

app.shell.verbose_quit = False 

return app.shell 

 

####################### 

# IPython TerminalApp # 

####################### 

from IPython.terminal.ipapp import TerminalIPythonApp, IPAppCrashHandler 

from IPython.core.crashhandler import CrashHandler 

 

class SageCrashHandler(IPAppCrashHandler): 

def __init__(self, app): 

""" 

A custom :class:`CrashHandler` which gives the user 

instructions on how to post the problem to sage-support. 

 

EXAMPLES:: 

 

sage: from sage.repl.interpreter import SageTerminalApp, SageCrashHandler 

sage: app = SageTerminalApp.instance() 

sage: sch = SageCrashHandler(app); sch 

<sage.repl.interpreter.SageCrashHandler object at 0x...> 

sage: sorted(sch.info.items()) 

[('app_name', u'Sage'), 

('bug_tracker', 'http://trac.sagemath.org'), 

('contact_email', 'sage-support@googlegroups.com'), 

('contact_name', 'sage-support'), 

('crash_report_fname', u'Crash_report_Sage.txt')] 

""" 

contact_name = 'sage-support' 

contact_email = 'sage-support@googlegroups.com' 

bug_tracker = 'http://trac.sagemath.org' 

CrashHandler.__init__(self, 

app, contact_name, contact_email, bug_tracker, show_crash_traceback=False) 

self.crash_report_fname = 'Sage_crash_report.txt' 

 

 

class SageTerminalApp(TerminalIPythonApp): 

name = u'Sage' 

crash_handler_class = SageCrashHandler 

 

test_shell = Bool(False, help='Whether the shell is a test shell') 

test_shell.tag(config=True) 

shell_class = Type(InteractiveShell, help='Type of the shell') 

shell_class.tag(config=True) 

 

def load_config_file(self, *args, **kwds): 

r""" 

Merges a config file with the default sage config. 

 

.. note:: 

 

This code is based on :meth:`Application.update_config`. 

 

TESTS: 

 

Test that :trac:`15972` has been fixed:: 

 

sage: from sage.misc.temporary_file import tmp_dir 

sage: from sage.repl.interpreter import SageTerminalApp 

sage: d = tmp_dir() 

sage: from IPython.paths import get_ipython_dir 

sage: IPYTHONDIR = get_ipython_dir() 

sage: os.environ['IPYTHONDIR'] = d 

sage: SageTerminalApp().load_config_file() 

sage: os.environ['IPYTHONDIR'] = IPYTHONDIR 

""" 

super(SageTerminalApp, self).load_config_file(*args, **kwds) 

newconfig = sage_ipython_config.default() 

# merge in the config loaded from file 

newconfig.merge(self.config) 

self.config = newconfig 

 

def init_shell(self): 

r""" 

Initialize the :class:`SageInteractiveShell` instance. 

 

.. note:: 

 

This code is based on 

:meth:`TerminalIPythonApp.init_shell`. 

 

EXAMPLES:: 

 

sage: from sage.repl.interpreter import SageTerminalApp 

sage: app = SageTerminalApp.instance() 

sage: app.shell 

<sage.repl.interpreter.SageTestShell object at 0x...> 

""" 

# Shell initialization 

self.shell = self.shell_class.instance( 

parent=self, 

config=self.config, 

profile_dir=self.profile_dir, 

ipython_dir=self.ipython_dir) 

self.shell.configurables.append(self) 

self.shell.has_sage_extensions = SAGE_EXTENSION in self.extensions 

 

# Load the %lprun extension if available 

try: 

import line_profiler 

except ImportError: 

pass 

else: 

self.extensions.append('line_profiler') 

 

if self.shell.has_sage_extensions: 

self.extensions.remove(SAGE_EXTENSION) 

 

# load sage extension here to get a crash if 

# something is wrong with the sage library 

self.shell.extension_manager.load_extension(SAGE_EXTENSION)