(i)pdb _runscript leads to KeyError: '_oh'

When I run ipdb or pdb in iPython (v7.22.0) using _runscript (as, e.g. elpy-shell does), after exiting the (i)pdb sub-console, any self-printing command leads to:

ipdb> q

In [23]: x
Out[23]: ---------------------------------------------------------------------------
KeyError                                  Traceback (most recent call last)
~/code/python/scraps/test_edb.py in <module>
----> 1 x

/usr/local/Cellar/ipython/7.22.0/libexec/lib/python3.9/site-packages/IPython/core/displayhook.py in __call__(self, result)
    261             self.write_output_prompt()
    262             format_dict, md_dict = self.compute_format_data(result)
--> 263             self.update_user_ns(result)
    264             self.fill_exec_result(result)
    265             if format_dict:

/usr/local/Cellar/ipython/7.22.0/libexec/lib/python3.9/site-packages/IPython/core/displayhook.py in update_user_ns(self, result)
    199 
    200         # Avoid recursive reference when displaying _oh/Out
--> 201         if self.cache_size and result is not self.shell.user_ns['_oh']:
    202             if len(self.shell.user_ns['_oh']) >= self.cache_size and self.do_full_cache:
    203                 self.cull_cache()

KeyError: '_oh'

[MrMino]

@jdtsmith I’ve literally just stumbled upon that too 😃. BTW. you can view the source of a magic (and for that matter, any other function / class, if you substitute %run) in IPython by issuing

%run??

Using single ? shows the object’s docstring.

[jdtsmith]

Thanks. I have since found that %run -d does much of what I want, and does preserve the locals and restore them when ipdb finishes. I’m not sure how %run accomplishes that, but glad to have discovered.