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): (source)

Initialize an unpersistable object with a descriptive reason string.

def __repr__(self): (source)
Undocumented
API Documentation for Twisted, generated by pydoctor at 2017-06-11 10:59:01.