---------------------------------------------------------------------------AttributeError                            Traceback (most recent call last)File ~/.local/lib/python3.13/site-packages/IPython/core/formatters.py:711, in PlainTextFormatter.__call__(self, obj)    704 stream = StringIO()    705 printer = pretty.RepresentationPrinter(stream, self.verbose,    706     self.max_width, self.newline,    707     max_seq_length=self.max_seq_length,    708     singleton_pprinters=self.singleton_printers,    709     type_pprinters=self.type_printers,    710     deferred_pprinters=self.deferred_printers)--> 711 printer.pretty(obj)    712 printer.flush()    713 return stream.getvalue()File ~/.local/lib/python3.13/site-packages/IPython/lib/pretty.py:394, in RepresentationPrinter.pretty(self, obj)    391 for cls in _get_mro(obj_class):    392     if cls in self.type_pprinters:    393         # printer registered in self.type_pprinters--> 394         return self.type_pprinters[cls](obj, self, cycle)    395     else:    396         # deferred printer    397         printer = self._in_deferred_types(cls)File ~/.local/lib/python3.13/site-packages/IPython/lib/pretty.py:740, in _re_pattern_pprint(obj, p, cycle)    738 re_compile = CallExpression.factory('re.compile')    739 if obj.flags:--> 740     p.pretty(re_compile(RawStringLiteral(obj.pattern), _ReFlags(obj.flags)))    741 else:    742     p.pretty(re_compile(RawStringLiteral(obj.pattern)))File ~/.local/lib/python3.13/site-packages/IPython/lib/pretty.py:408, in RepresentationPrinter.pretty(self, obj)    406     meth = cls._repr_pretty_    407     if callable(meth):--> 408         return meth(obj, self, cycle)    409 if (    410     cls is not object    411     # check if cls defines __repr__   (...)    417     and callable(_safe_getattr(cls, "__repr__", None))    418 ):    419     return _repr_pprint(obj, self, cycle)File ~/.local/lib/python3.13/site-packages/IPython/lib/pretty.py:573, in CallExpression._repr_pretty_(self, p, cycle)    571 for arg in self.args:    572     new_item()--> 573     p.pretty(arg)    574 for arg_name, arg in self.kwargs.items():    575     new_item()File ~/.local/lib/python3.13/site-packages/IPython/lib/pretty.py:408, in RepresentationPrinter.pretty(self, obj)    406     meth = cls._repr_pretty_    407     if callable(meth):--> 408         return meth(obj, self, cycle)    409 if (    410     cls is not object    411     # check if cls defines __repr__   (...)    417     and callable(_safe_getattr(cls, "__repr__", None))    418 ):    419     return _repr_pprint(obj, self, cycle)File ~/.local/lib/python3.13/site-packages/IPython/lib/pretty.py:729, in _ReFlags._repr_pretty_(self, p, cycle)    726 done_one = False    727 for flag in ('TEMPLATE', 'IGNORECASE', 'LOCALE', 'MULTILINE', 'DOTALL',    728     'UNICODE', 'VERBOSE', 'DEBUG'):--> 729     if self.value & getattr(re, flag):    730         if done_one:    731             p.text('|')AttributeError: module 're' has no attribute 'TEMPLATE'

Apparently it was "undocumented and never working" (#32300). That was reverted and then usage deprecated immediately in#93161.

Status of existingre.TEMPLATE attribute in currently supported Python versions for IPython:

https://github.com/python/cpython/blob/3.10/Lib/re.py#L154 "disable backtracking"
https://github.com/python/cpython/blob/3.11/Lib/re/__init__.py#L152 "unknown purpose, deprecated"
https://github.com/python/cpython/blob/3.12/Lib/re/__init__.py#L153 "unknown purpose, deprecated"

Since 3.11, using it in the first place causes warnings:

$ python3.11 -WallPython 3.11.10 (main, Oct 16 2024, 10:51:55) [GCC 12.2.0] on linuxType "help", "copyright", "credits" or "license" for more information.>>> import re>>> re.compile("", flags=re.TEMPLATE).../Python-3.11.10/lib/python3.11/re/__init__.py:289: DeprecationWarning: The re.TEMPLATE/re.T flag is deprecated as it is an undocumented flag without an obvious purpose. Don't use it.  warnings.warn("The re.TEMPLATE/re.T flag is deprecated "re.compile('', re.TEMPLATE)

#14559 offers an alternative approach, but it will change the pretty-print result for 3.10-3.12, I'm not sure if that would be considered a backwards-compatibility breaking change.