This is an instance of a class that comes back when something couldn't be unpersisted.

Method __init__ Initialize an unpersistable object with a descriptive reason string.
Method __repr__ Undocumented
def __init__(self, reason):

Initialize an unpersistable object with a descriptive reason string.

def __repr__(self):
Undocumented
API Documentation for twisted, generated by pydoctor at 2020-03-25 17:34:30.