I need to use `pdb.set_trace()` in the base class. It has a method:

```
def run(self, *args, **kwargs):
    raise NotImplementedError
```
Since this base class is derived by many subclasses I don't know before hand which class' `run()` method I need to get inside. Also there is some pre processing of the arguments given to the `run()` method. So when `pdb` reaches the line,

```
q=self.run(arguments)
```

and I hit `s` it acts as if I have given the command `next`.

How can I get inside the derived class' `run()` method with `pdb` and debug the code over there?