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Custom pickling doc #426

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Custom pickling doc #426

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14 changes: 14 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -160,6 +160,20 @@ With trace, we see how ``dill`` stored the lambda (``F1``) by first storing
(which is used to handle code objects), then we handle the reference to
the global dict (``D2``). A ``#`` marks when the object is actually stored.

Custom pickling

```python
import dill
from sqlalchemy import create_engine
from sqlalchemy.engine import Engine

@dill.register(Engine)
def save_sqlalchemy_engine(pickler, obj):
pickler._byref = getattr(pickler, '_byref', False)
pickler._recurse = getattr(pickler, '_recurse', False)
pickler.save_reduce(create_engine, (obj.url,), obj=obj)
```


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