How to create a second None in Python? Making a singleton object where the id is always the same

Question

WARNING: The following question is asking for information concerning poor practices and dirty code. Developer discretion is advised.

Note: This is different than th

Answer 1

Is there anything I can do to achieve this same behavior with pickling?

Yes.

class _NoParamType(object):
    def __new__(cls):
        return NoParam
    def __reduce__(self):
        return (_NoParamType, ())

NoParam = object.__new__(_NoParamType)

To take it even further: is there anything I can do to ensure that only one instance of NoParam is ever created?

Not without writing NoParam in C. Unless you write it in C and take advantage of C API-only capabilities, it'll always be possible to do object.__new__(type(NoParam)) to get another instance.