Autoreload slow

On upgrading from 7.5 to 7.6.1, autoreload in Jupyter Notebook is much slower, to the point of seeming to hang for a >minute. When I lose my patience and interrupt execution, I get a traceback like this

[autoreload of algos.ppo.nets failed: Traceback (most recent call last):
  File "/opt/conda/lib/python3.7/site-packages/IPython/extensions/autoreload.py", line 245, in check
    superreload(m, reload, self.old_objects)
  File "/opt/conda/lib/python3.7/site-packages/IPython/extensions/autoreload.py", line 450, in superreload
    update_generic(old_obj, new_obj)
  File "/opt/conda/lib/python3.7/site-packages/IPython/extensions/autoreload.py", line 387, in update_generic
    update(a, b)
  File "/opt/conda/lib/python3.7/site-packages/IPython/extensions/autoreload.py", line 357, in update_class
    update_instances(old, new)
  File "/opt/conda/lib/python3.7/site-packages/IPython/extensions/autoreload.py", line 317, in update_instances
    update_instances(old, new, obj, visited)
  File "/opt/conda/lib/python3.7/site-packages/IPython/extensions/autoreload.py", line 317, in update_instances
    update_instances(old, new, obj, visited)
  File "/opt/conda/lib/python3.7/site-packages/IPython/extensions/autoreload.py", line 317, in update_instances
    update_instances(old, new, obj, visited)
  [Previous line repeated 2 more times]
  File "/opt/conda/lib/python3.7/site-packages/IPython/extensions/autoreload.py", line 300, in update_instances
    for obj in (obj for obj in objects if id(obj) not in visited):
KeyboardInterrupt
]

I don’t have a minimal example I’m afraid, but if anyone arrives here Googling for a similar problem, rolling back to 7.5 fixes it.

My specs are

Ubuntu 18.04.2 LTS Python 3.73 Jupyter:

jupyter==1.0.0
jupyter-client==5.3.0
jupyter-console==6.0.0
jupyter-contrib-core==0.3.3
jupyter-contrib-nbextensions==0.5.1
jupyter-core==4.5.0
jupyter-highlight-selected-word==0.2.0
jupyter-latex-envs==1.4.6
jupyter-nbextensions-configurator==0.4.1

[smerzbach]

I can’t add further debug info, but I had a similar problem with ipython-7.6.1 and Spyder-3.3.6:

• open ipython console
• select some code in the editor
• hit F9 (this essentially copies the code to the console and executes it)

Every other time, this causes ipython to hang until interrupted by ctr+c, which then gives a stacktrace as pasted above. Repeating the exact same procedure works fine on the next try. Downgrading to ipython-7.5 resolved the issues.

This is all on a Ubuntu 16.04, with Spyder and ipython installed via pip3:

pip3 install --user --upgrade spyder3

To fix the issue:

pip3 install --user ipython==7.5

Is there further info I could provide?

[bnaul]

This problem seems to be extra bad when I’m working with large pandas DataFrames; is it possible that every single string value is getting scanned by the autoreload logic? If so is there any possible way to work around this case?