Hi team,
This issue happened to me just one day ago.
I am aware of https://trac.sagemath.org/ticket/18492 and
https://www.mail-archive.com/[email protected]/msg1671690.html
as they have the same TypeError, but I think that is not my case.
Thanks for the help in advance!
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***************************************************************************
IPython post-mortem report
{'commit_hash': '<not found>',
'commit_source': '(none found)',
'default_encoding': 'utf-8',
'ipython_path': '/usr/lib/python3/dist-packages/IPython',
'ipython_version': '7.13.0',
'os_name': 'posix',
'platform': 'Linux-5.4.0-42-generic-x86_64-with-glibc2.29',
'sys_executable': '/usr/bin/python3',
'sys_platform': 'linux',
'sys_version': '3.8.2 (default, Jul 16 2020, 14:00:26) \n[GCC 9.3.0]'}
***************************************************************************
***************************************************************************
Crash traceback:
---------------------------------------------------------------------------
---------------------------------------------------------------------------
TypeError Python 3.8.2: /usr/bin/python3
Mon Aug 3 09:29:12 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 sage-python
2 # -*- coding: utf-8 -*-
3 """
4 Sage IPython startup script.
5 """
6
7 # Display startup banner. Do this before anything else to give the user
8 # early feedback that Sage is starting.
9 from sage.misc.banner import banner
10 banner()
11
12 from sage.repl.interpreter import SageTerminalApp
13
14 app = SageTerminalApp.instance()
---> 15 app.initialize()
global app.initialize = <bound method TerminalIPythonApp.initialize of
<sage.repl.interpreter.SageTerminalApp object at 0x7fcd35ef4160>>
16 app.start()
<decorator-gen-113> in initialize(self=<sage.repl.interpreter.SageTerminalApp
object>, argv=None)
/usr/lib/python3/dist-packages/traitlets/config/application.py in
catch_config_error(method=<function TerminalIPythonApp.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 TerminalIPythonApp.initialize at 0x7fcd347b9040>
app = <sage.repl.interpreter.SageTerminalApp object at 0x7fcd35ef4160>
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/python3/dist-packages/IPython/terminal/ipapp.py in
initialize(self=<sage.repl.interpreter.SageTerminalApp object>, argv=None)
302
303 return super(TerminalIPythonApp, self).parse_command_line(argv)
304
305 @catch_config_error
306 def initialize(self, argv=None):
307 """Do actions after construct, but before starting the app."""
308 super(TerminalIPythonApp, self).initialize(argv)
309 if self.subapp is not None:
310 # don't bother initializing further, starting subapp
311 return
312 # print self.extra_args
313 if self.extra_args and not self.something_to_run:
314 self.file_to_run = self.extra_args[0]
315 self.init_path()
316 # create the shell
--> 317 self.init_shell()
self.init_shell = <bound method SageTerminalApp.init_shell of
<sage.repl.interpreter.SageTerminalApp object at 0x7fcd35ef4160>>
318 # and draw the banner
319 self.init_banner()
320 # Now a variety of things that happen after the banner is
printed.
321 self.init_gui_pylab()
322 self.init_extensions()
323 self.init_code()
324
325 def init_shell(self):
326 """initialize the InteractiveShell instance"""
327 # Create an InteractiveShell instance.
328 # shell.display_banner should always be False for the terminal
329 # based app, because we call shell.show_banner() by hand below
330 # so the banner shows *before* all extension loading stuff.
331 self.shell = self.interactive_shell_class.instance(parent=self,
332 profile_dir=self.profile_dir,
/usr/lib/python3/dist-packages/sage/repl/interpreter.py in
init_shell(self=<sage.repl.interpreter.SageTerminalApp object>)
706 Initialize the :class:`SageInteractiveShell` instance.
707
708 .. note::
709
710 This code is based on
711 :meth:`TerminalIPythonApp.init_shell`.
712
713 EXAMPLES::
714
715 sage: from sage.repl.interpreter import SageTerminalApp
716 sage: app = SageTerminalApp.instance()
717 sage: app.shell
718 <sage.repl.interpreter.SageTestShell object at 0x...>
719 """
720 # Shell initialization
--> 721 self.shell = self.shell_class.instance(
self.shell = None
self.shell_class.instance = <bound method
SingletonConfigurable.instance of <class
'sage.repl.interpreter.SageTerminalInteractiveShell'>>
global parent = undefined
self = <sage.repl.interpreter.SageTerminalApp object at 0x7fcd35ef4160>
global config = undefined
self.config = {'TerminalIPythonApp': {'display_banner': False,
'verbose_crash': True, 'test_shell': False, 'shell_class': <class
'sage.repl.interpreter.SageTerminalInteractiveShell'>}, 'InteractiveShell':
{'prompts_class': <class 'sage.repl.prompts.SagePrompts'>,
'ast_node_interactivity': 'all', 'colors': 'LightBG', 'simple_prompt': False,
'term_title': True, 'confirm_exit': False, 'separate_in': ''},
'TerminalInteractiveShell': {'prompts_class': <class
'sage.repl.prompts.SagePrompts'>, 'ast_node_interactivity': 'all', 'colors':
'LightBG', 'simple_prompt': False, 'term_title': True, 'confirm_exit': False,
'separate_in': ''}, 'InteractiveShellApp': {'extensions': ['sage']},
'SageTerminalApp': {'force_interact': True}}
global profile_dir = undefined
self.profile_dir = <IPython.core.profiledir.ProfileDir object at
0x7fcd35d736a0>
global ipython_dir = undefined
self.ipython_dir = '/home/mystiz/.ipython'
722 parent=self,
723 config=self.config,
724 profile_dir=self.profile_dir,
725 ipython_dir=self.ipython_dir)
726 self.shell.configurables.append(self)
727 self.shell.has_sage_extensions = SAGE_EXTENSION in
self.extensions
728
729 # Load the %lprun extension if available
730 try:
731 import line_profiler
732 except ImportError:
733 pass
734 else:
735 self.extensions.append('line_profiler')
736
/usr/lib/python3/dist-packages/traitlets/config/configurable.py in
instance(cls=<class 'sage.repl.interpreter.SageTerminalInteractiveShell'>,
*args=(), **kwargs={'config': {'TerminalIPythonApp': {'display_banner':
False,...']}, 'SageTerminalApp': {'force_interact': True}}, 'ipython_dir':
'/home/mystiz/.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 = {'parent': <sage.repl.interpreter.SageTerminalApp object at
0x7fcd35ef4160>, 'config': {'TerminalIPythonApp': {'display_banner': False,
'verbose_crash': True, 'test_shell': False, 'shell_class': <class
'sage.repl.interpreter.SageTerminalInteractiveShell'>}, 'InteractiveShell':
{'prompts_class': <class 'sage.repl.prompts.SagePrompts'>,
'ast_node_interactivity': 'all', 'colors': 'LightBG', 'simple_prompt': False,
'term_title': True, 'confirm_exit': False, 'separate_in': ''},
'TerminalInteractiveShell': {'prompts_class': <class
'sage.repl.prompts.SagePrompts'>, 'ast_node_interactivity': 'all', 'colors':
'LightBG', 'simple_prompt': False, 'term_title': True, 'confirm_exit': False,
'separate_in': ''}, 'InteractiveShellApp': {'extensions': ['sage']},
'SageTerminalApp': {'force_interact': True}}, 'profile_dir':
<IPython.core.profiledir.ProfileDir object at 0x7fcd35d736a0>, 'ipython_dir':
'/home/mystiz/.ipython'}
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/python3/dist-packages/IPython/terminal/interactiveshell.py in
__init__(self=<sage.repl.interpreter.SageTerminalInteractiveShell object>,
*args=(), **kwargs={'config': {'TerminalIPythonApp': {'display_banner':
False,...']}, 'SageTerminalApp': {'force_interact': True}}, 'ipython_dir':
'/home/mystiz/.ipython', 'parent': <sage.repl.interpreter.SageTerminalApp
object>, 'profile_dir': <IPython.core.profiledir.ProfileDir object>})
504
505 def init_alias(self):
506 # The parent class defines aliases that can be safely used with
any
507 # frontend.
508 super(TerminalInteractiveShell, self).init_alias()
509
510 # Now define aliases that only make sense on the terminal,
because they
511 # need direct access to the console in a way that we can't
emulate in
512 # GUI or web frontend
513 if os.name == 'posix':
514 for cmd in ('clear', 'more', 'less', 'man'):
515 self.alias_manager.soft_define_alias(cmd, cmd)
516
517
518 def __init__(self, *args, **kwargs):
--> 519 super(TerminalInteractiveShell, self).__init__(*args, **kwargs)
global super = undefined
global TerminalInteractiveShell = <class
'IPython.terminal.interactiveshell.TerminalInteractiveShell'>
self.__init__ = <bound method TerminalInteractiveShell.__init__ of
<sage.repl.interpreter.SageTerminalInteractiveShell object at 0x7fcd347b5f40>>
args = ()
kwargs = {'parent': <sage.repl.interpreter.SageTerminalApp object at
0x7fcd35ef4160>, 'config': {'TerminalIPythonApp': {'display_banner': False,
'verbose_crash': True, 'test_shell': False, 'shell_class': <class
'sage.repl.interpreter.SageTerminalInteractiveShell'>}, 'InteractiveShell':
{'prompts_class': <class 'sage.repl.prompts.SagePrompts'>,
'ast_node_interactivity': 'all', 'colors': 'LightBG', 'simple_prompt': False,
'term_title': True, 'confirm_exit': False, 'separate_in': ''},
'TerminalInteractiveShell': {'prompts_class': <class
'sage.repl.prompts.SagePrompts'>, 'ast_node_interactivity': 'all', 'colors':
'LightBG', 'simple_prompt': False, 'term_title': True, 'confirm_exit': False,
'separate_in': ''}, 'InteractiveShellApp': {'extensions': ['sage']},
'SageTerminalApp': {'force_interact': True}}, 'profile_dir':
<IPython.core.profiledir.ProfileDir object at 0x7fcd35d736a0>, 'ipython_dir':
'/home/mystiz/.ipython'}
520 self.init_prompt_toolkit_cli()
521 self.init_term_title()
522 self.keep_running = True
523
524 self.debugger_history = InMemoryHistory()
525
526 def ask_exit(self):
527 self.keep_running = False
528
529 rl_next_input = None
530
531 def interact(self, display_banner=DISPLAY_BANNER_DEPRECATED):
532
533 if display_banner is not DISPLAY_BANNER_DEPRECATED:
534 warn('interact `display_banner` argument is deprecated
since IPython 5.0. Call `show_banner()` if needed.', DeprecationWarning,
stacklevel=2)
/usr/lib/python3/dist-packages/IPython/core/interactiveshell.py in
__init__(self=<sage.repl.interpreter.SageTerminalInteractiveShell object>,
ipython_dir='/home/mystiz/.ipython',
profile_dir=<IPython.core.profiledir.ProfileDir object>, user_module=None,
user_ns=None, custom_exceptions=((), None), **kwargs={'config':
{'TerminalIPythonApp': {'display_banner': False,...']}, 'SageTerminalApp':
{'force_interact': True}}, 'parent': <sage.repl.interpreter.SageTerminalApp
object>})
668 self.init_pushd_popd_magic()
669 self.init_user_ns()
670 self.init_logger()
671 self.init_builtins()
672
673 # The following was in post_config_initialization
674 self.init_inspector()
675 self.raw_input_original = input
676 self.init_completer()
677 # TODO: init_io() needs to happen before init_traceback handlers
678 # because the traceback handlers hardcode the stdout/stderr
streams.
679 # This logic in in debugger.Pdb and should eventually be
changed.
680 self.init_io()
681 self.init_traceback_handlers(custom_exceptions)
682 self.init_prompts()
--> 683 self.init_display_formatter()
self.init_display_formatter = <bound method
SageTerminalInteractiveShell.init_display_formatter of
<sage.repl.interpreter.SageTerminalInteractiveShell object at 0x7fcd347b5f40>>
684 self.init_display_pub()
685 self.init_data_pub()
686 self.init_displayhook()
687 self.init_magics()
688 self.init_alias()
689 self.init_logstart()
690 self.init_pdb()
691 self.init_extension_manager()
692 self.init_payload()
693 self.init_deprecation_warnings()
694 self.hooks.late_startup_hook()
695 self.events.trigger('shell_initialized', self)
696 atexit.register(self.atexit_operations)
697
698 # The trio runner is used for running Trio in the foreground
thread. It
/usr/lib/python3/dist-packages/sage/repl/interpreter.py in
init_display_formatter(self=<sage.repl.interpreter.SageTerminalInteractiveShell
object>)
242
243 sage: from sage.repl.interpreter import
SageTerminalInteractiveShell
244 sage: SageTerminalInteractiveShell() # not tested
245 <sage.repl.interpreter.SageNotebookInteractiveShell object at
0x...>
246 """
247
248 def init_display_formatter(self):
249 """
250 Switch to the Sage IPython commandline rich output backend
251
252 EXAMPLES::
253
254 sage: from sage.repl.interpreter import
SageTerminalInteractiveShell
255 sage:
SageTerminalInteractiveShell().init_display_formatter() # not tested
256 """
--> 257 from sage.repl.rich_output.backend_ipython import
BackendIPythonCommandline
global sage.repl.rich_output.backend_ipython = undefined
BackendIPythonCommandline = undefined
258 backend = BackendIPythonCommandline()
259 backend.get_display_manager().switch_backend(backend,
shell=self)
260
261
262 class SageTestShell(SageShellOverride, TerminalInteractiveShell):
263 """
264 Test Shell
265
266 Care must be taken in these doctests to quit the test shell in
267 order to switch back the rich output display backend to the
268 doctest backend.
269
270 EXAMPLES::
271
272 sage: from sage.repl.interpreter import get_test_shell
/usr/lib/python3/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/python3/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 <[email protected]>
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):
/usr/lib/python3/dist-packages/sage/structure/__init__.py in <module>
1 # Resolve a cyclic import
----> 2 import sage.structure.element
global sage.structure.element = undefined
/usr/lib/python3/dist-packages/sage/structure/category_object.pxd in init
sage.structure.element (build/cythonized/sage/structure/element.c:34132)()
1
#*****************************************************************************
2 # Copyright (C) 2006 William Stein <[email protected]>
3 #
4 # This program is free software: you can redistribute it and/or modify
5 # it under the terms of the GNU General Public License as published by
6 # the Free Software Foundation, either version 2 of the License, or
7 # (at your option) any later version.
8 # http://www.gnu.org/licenses/
9
#*****************************************************************************
10
11 from sage.structure.sage_object cimport SageObject
12
13 cpdef check_default_category(default_category, category)
14
---> 15 cdef class CategoryObject(SageObject):
global cdef = undefined
global CategoryObject = undefined
global SageObject = undefined
16 cdef public dict __cached_methods
17 cdef _category
18 cdef public _base
19 cdef public _names
20 cdef public _factory_data
21 cdef object __weakref__
22 cdef long _hash_value
23
24 cdef getattr_from_category(self, name)
25
26 cpdef normalize_names(Py_ssize_t ngens, names)
27 cpdef bint certify_names(names) except -1
/usr/lib/python3/dist-packages/sage/structure/category_object.pyx in init
sage.structure.category_object
(build/cythonized/sage/structure/category_object.c:9881)()
45 (1, 0, 0, 0)
46 sage: M.gens()
47 ((1, 0, 0, 0), (0, 1, 0, 0), (0, 0, 1, 0), (0, 0, 0, 1))
48 """
49
50
#*****************************************************************************
51 # This program is free software: you can redistribute it and/or modify
52 # it under the terms of the GNU General Public License as published by
53 # the Free Software Foundation, either version 2 of the License, or
54 # (at your option) any later version.
55 # http://www.gnu.org/licenses/
56
#*****************************************************************************
57
58 from sage.cpython.getattr import dir_with_other_class
59 from sage.cpython.getattr cimport getattr_from_other_class
---> 60 from sage.categories.category import Category
global sage.categories.category = undefined
global Category = undefined
61 from sage.structure.debug_options cimport debug
62 from sage.misc.cachefunc import cached_method
63 from sage.structure.dynamic_class import DynamicMetaclass
64
65
66 cpdef inline check_default_category(default_category, category):
67 ## The resulting category is guaranteed to be
68 ## a sub-category of the default.
69 if category is None:
70 return default_category
71 return default_category.join([default_category,category])
72
73
74 cdef class CategoryObject(SageObject):
75 """
/usr/lib/python3/dist-packages/sage/categories/category.py in <module>
95 #
****************************************************************************
96 # Copyright (C) 2005 David Kohel <[email protected]> and
97 # William Stein <[email protected]>
98 # 2008-2014 Nicolas M. Thiery <nthiery at users.sf.net>
99 #
100 # Distributed under the terms of the GNU General Public License (GPL)
101 # https://www.gnu.org/licenses/
102 #
****************************************************************************
103
104 import inspect
105 from warnings import warn
106 from sage.misc.abstract_method import abstract_method,
abstract_methods_of_class
107 from sage.misc.cachefunc import cached_method, cached_function
108 from sage.misc.c3_controlled import _cmp_key, _cmp_key_named,
C3_sorted_merge
109 from sage.misc.lazy_attribute import lazy_attribute
--> 110 from sage.misc.unknown import Unknown
global sage.misc.unknown = undefined
global Unknown = undefined
111 from sage.misc.weak_dict import WeakValueDictionary
112
113 from sage.structure.sage_object import SageObject
114 from sage.structure.unique_representation import UniqueRepresentation
115 from sage.structure.dynamic_class import DynamicMetaclass, dynamic_class
116
117 from sage.categories.category_cy_helper import category_sort_key,
_sort_uniq, _flatten_categories, join_as_tuple
118
119 _join_cache = WeakValueDictionary()
120
121 class Category(UniqueRepresentation, SageObject):
122 r"""
123 The base class for modeling mathematical categories, like for
example:
124
125 - ``Groups()``: the category of groups
/usr/lib/python3/dist-packages/sage/misc/unknown.py in <module>
1 """
2 The Unknown truth value
3
4 AUTHORS:
5
6 - Florent Hivert (2010): initial version.
7 """
8 from __future__ import print_function
9
10 from sage.structure.sage_object import SageObject
---> 11 from sage.structure.unique_representation import UniqueRepresentation
global sage.structure.unique_representation = undefined
global UniqueRepresentation = undefined
12 from sage.structure.richcmp import richcmp_method, rich_to_bool
13
14
15 @richcmp_method
16 class UnknownClass(UniqueRepresentation, SageObject):
17 """
18 TESTS::
19
20 sage: TestSuite(Unknown).run()
21 """
22 def __init__(self):
23 """
24 The ``Unknown`` truth value
25
26 EXAMPLES::
27
28 sage: l = [False, Unknown, True]
29 sage: for a in l: print([a and b for b in l])
30 [False, False, False]
31 [Unknown, Unknown, Unknown]
/usr/lib/python3/dist-packages/sage/structure/unique_representation.py in
<module>
555 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
556 # General Public License for more details.
557 #
558 # The full text of the GPL is available at:
559 #
560 # https://www.gnu.org/licenses/
561
#******************************************************************************
562 from __future__ import print_function
563
564 from sage.misc import six
565 from sage.misc.cachefunc import weak_cached_function
566 from sage.misc.classcall_metaclass import ClasscallMetaclass, typecall
567 from sage.misc.fast_methods import WithEqualityById
568
569
--> 570 class CachedRepresentation(six.with_metaclass(ClasscallMetaclass)):
global CachedRepresentation = undefined
global six.with_metaclass = <function with_metaclass at 0x7fcd35d32700>
global ClasscallMetaclass = <class
'sage.misc.classcall_metaclass.ClasscallMetaclass'>
571 """
572 Classes derived from CachedRepresentation inherit a weak cache for
their
573 instances.
574
575 .. NOTE::
576
577 If this class is used as a base class, then instances are
(weakly)
578 cached, according to the arguments used to create the instance.
579 Pickling is provided, of course by using the cache.
580
581 .. NOTE::
582
583 Using this class, one can have arbitrary hash and comparison.
584 Hence, *unique* representation behaviour is *not* provided.
585
~/.local/lib/python3.8/site-packages/six.py in with_metaclass(meta=<class
'sage.misc.classcall_metaclass.ClasscallMetaclass'>, *bases=())
794 return f
795 return wrapper
796 else:
797 wraps = functools.wraps
798
799
800 def with_metaclass(meta, *bases):
801 """Create a base class with a metaclass."""
802 # This requires a bit of explanation: the basic idea is to make a
dummy
803 # metaclass for one level of class instantiation that replaces
itself with
804 # the actual metaclass.
805 class metaclass(meta):
806
807 def __new__(cls, name, this_bases, d):
808 return meta(name, bases, d)
--> 809 return type.__new__(metaclass, 'temporary_class', (), {})
global type.__new__ = undefined
metaclass = <class 'six.with_metaclass.<locals>.metaclass'>
810
811
812 def add_metaclass(metaclass):
813 """Class decorator for creating a class with a metaclass."""
814 def wrapper(cls):
815 orig_vars = cls.__dict__.copy()
816 slots = orig_vars.get('__slots__')
817 if slots is not None:
818 if isinstance(slots, str):
819 slots = [slots]
820 for slots_var in slots:
821 orig_vars.pop(slots_var)
822 orig_vars.pop('__dict__', None)
823 orig_vars.pop('__weakref__', None)
824 return metaclass(cls.__name__, cls.__bases__, orig_vars)
TypeError: type.__new__(metaclass) is not safe, use
sage.misc.classcall_metaclass.ClasscallMetaclass.__new__()
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History of session input:
