exclude not working

Even though I include --exclude ModelName, I still see that model in the output.

This is true for imported modules in the file.

```python
from abc import Xyz

class PQR(BaseModel):
   x: Xyz

```

Now if I export it will also export Xyz
if I do `--exclude Xyz` it still exports it
If I do `--exclude PQR` then it still export Xyz but not PQR
