RuntimeError: dictionary changed size during iteration

[bradmonk]

>>> %tb
RuntimeError: dictionary changed size during iteration
....
<ipython-input-1-12c676190a3c> in __rodeo_get_variables(session)
     29 
     30     SPECIAL_VARS = ["In", "Out"]
---> 31     for variable_name in session.keys():
     32 
     33         if variable_name.startswith("_") or variable_name in SPECIAL_VARS:
RuntimeError: dictionary changed size during iteration

rodeo/src/node/kernels/python/patch.py

Line 31 in aa1929b

for variable_name in session.keys():

In Python 2.x calling keys makes a copy of the key that you can iterate over while modifying the dict:

for variable_name in session.keys():

This doesn't work in Python 3.x because keys returns an iterator instead of a list. Apparently the work-around for Python 3.x is to use list() to force a copy of the keys to be made:

for variable_name in list(session):