`nbformat._struct:Struct.setattr`

Signature

def __setattr__(self, key, value)

Set an attr with protection of class members.

This calls self.__setitem__ but convert KeyError to AttributeError.

s = Struct()
s.a = 10
s.a
try:
    s.get = 10
except AttributeError:
    print("you can't set a class member")