Gevent: NotImplementedError

Question

Why is gevent throwing this error? Running it in ipython, ubuntu 13

In [1]: from gevent import monkey

In [2]: monkey.patch_all()

In [3]: The history saving thread hit an unexpected error (NotImplementedError('gevent is only usable from a single thread',)).History will not be written to the database.


In [3]:

Answer 1

ipython uses a separate thread to save command history. Because gevent patches threading methods, that pre-existing separate thread triggers the gevent 'single thread' exception.

I would not use gevent in ipython; ipython is not compatible with gevent.

At the very least, try to patch out fewer things; try gevent.monkey.patch_all(thread=False) and see if fewer things in ipython break.