Hello, I'm trying to use sympy in a Jupyter notebook, however, it seems that sympy.init_session() does too much magic. If I call it without arguments it fails with this exception:
> --------------------------------------------------------------------------- > MultipleInstanceError Traceback (most recent call last) > <ipython-input-15-93c617afb26a> in <module>() > ----> 1 sympy.init_session() > > /opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/sympy/interactive/session.py > in init_session(ipython, pretty_print, order, use_unicode, use_latex, quiet, > auto_symbols, auto_int_to_Integer, str_printer, pretty_printer, > latex_printer, argv) > 431 else: > 432 ip = init_ipython_session(argv=argv, > auto_symbols=auto_symbols, > --> 433 auto_int_to_Integer=auto_int_to_Integer) > 434 > 435 if V(IPython.__version__) >= '0.11': > > /opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/sympy/interactive/session.py > in init_ipython_session(argv, auto_symbols, auto_int_to_Integer) > 262 # don't draw IPython banner during initialization: > 263 app.display_banner = False > --> 264 app.initialize(argv) > 265 > 266 if auto_symbols: > > <decorator-gen-112> in initialize(self, argv) > > /opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/traitlets/config/application.py > in catch_config_error(method, app, *args, **kwargs) > 85 """ > 86 try: > ---> 87 return method(app, *args, **kwargs) > 88 except (TraitError, ArgumentError) as e: > 89 app.print_help() > > /opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/IPython/terminal/ipapp.py > in initialize(self, argv) > 315 self.init_path() > 316 # create the shell > --> 317 self.init_shell() > 318 # and draw the banner > 319 self.init_banner() > > /opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/IPython/terminal/ipapp.py > in init_shell(self) > 331 self.shell = > self.interactive_shell_class.instance(parent=self, > 332 profile_dir=self.profile_dir, > --> 333 ipython_dir=self.ipython_dir, > user_ns=self.user_ns) > 334 self.shell.configurables.append(self) > 335 > > /opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/traitlets/config/configurable.py > in instance(cls, *args, **kwargs) > 421 raise MultipleInstanceError( > 422 'Multiple incompatible subclass instances of ' > --> 423 '%s are being created.' % cls.__name__ > 424 ) > 425 > > MultipleInstanceError: Multiple incompatible subclass instances of > TerminalInteractiveShell are being created. > IPython is version 6.2.0, Sympy is version 1.1.1. I tried playing with the ipython argument to init_session() but both True and False values did not do much good (did not get something usable). The strange thing is that I have a sympy working just fine in a Jupyter notebook on a work machine where I use Anaconda (this machine uses an macports instead). I don't know if Anaconda patches Sympy somehow or if it uses an older version that does not have this problem. I can check that tomorrow. Looking at the code for init_session() it seems that the possibility of it being called in an IPython session is not handled. This bug report is about the same issue: https://github.com/sympy/sympy/issues/13319 Thanks. Cheers, Daniele -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at https://groups.google.com/group/sympy. To view this discussion on the web visit https://groups.google.com/d/msgid/sympy/94e5c054-c039-9ebb-fca9-23e53efc1cc5%40grinta.net. For more options, visit https://groups.google.com/d/optout.
