shadowing definition by decorator

shadowing.py

# shadowing definition by decorator

import sys

class shadowing:
    def __new__(cls, klass):
        self = super().__new__(cls)
        self._klass = klass
        setattr(sys.modules[klass.__module__], klass.__name__, self)
        return klass

    def __del__(self):
        delattr(sys.modules[self._klass.__module__], self._klass.__name__)

@shadowing
class X:
    pass

print(getattr(sys.modules[__name__], "X", "There is no X"))