TypeError: __repr__ returned non-string (type NoneType)

[chad-yao]

trafficstars

Following Interactive Information Access and Debugging

Info about ipdb:

pip show ipdb Name: ipdb Version: 0.13.13

     16 import ipdb
     17 
---> 18 ipdb.set_trace()

ipdb> scene
*** TypeError: __repr__ returned non-string (type NoneType)