python runtime_error ai_generated true

NotImplementedError

ID: python/notimplementederror

Also available as: JSON · Markdown

90%Fix Rate

90%Confidence

50Evidence

2023-01-01First Seen

Version Compatibility

Version	Status	Introduced	Deprecated	Notes
311	active	—	—	—

Abstract method not implemented in subclass. The parent class requires you to override this method.

generic

95% success Implement the method in your subclass with the correct signature
```
class MySubclass(BaseClass):
    def required_method(self, arg):  # Match parent's signature exactly
        return self.process(arg)
```
Sources: https://docs.python.org/3/library/abc.html#abc.abstractmethod
85% success If you don't need this method, provide a no-op: def method(self): pass
```
def method(self): pass
```
Sources: https://docs.python.org/3/library/exceptions.html#NotImplementedError

Common approaches that don't work:

Call super() to use parent implementation 85% fail
Parent raises NotImplementedError — there is no implementation to call
Remove the abstract method from parent 70% fail
Other subclasses may depend on the abstract contract

Preceded by: