@Serhiy 

> Do you mean sharing values of co_code and co_lnotab between code objects of the same module?

Yes.

> How much memory does this save (in absolute and relative value)?

Maybe 1~3%, but I am not sure. I am more interested in reducing number of objects, because it will reduce import time.
Additionally, co_code is used while executing code. Unlike other cold data (e.g. docstring, annotations), sharing co_code will improve CPU cache utilization.

> Which functions have the same co_code?

For example,

```
# logging/__init__.py

    @property
    def manager(self):
        return self.logger.manager
...
    @property
    def name(self):
        return self.logger.name
```

Such simple functions are very common in OO-style code.

@Mark Shannon

Sure.