function not found with error AttributeError: "'module' has no attribute 'pre_save'"

I have the small script below that I try to test:

```python
import sys

def pre_save(value, numb):
if value == "value":
return("accepted by Python script " + sys.version)
else:
return("refused by Python script" + sys.version)
```

When I do a ` py.RunSrc(ctx, pythonCode, "", nil)`, I get "AttributeError: "'module' has no attribute 'pre_save'""