datasets doesn't work with python 3.14
State: closed

### Describe the bug

Seems that `dataset` doesn't work with python==3.14. The root cause seems to be something with a `deel` API that was changed.
```
TypeError: Pickler._batch_setitems() takes 2 positional arguments but 3 were given
```

### Steps to reproduce the bug

(on a new folder)
uv init 
uv python pin 3.14
uv add datasets
uv run python 

(in REPL)
import datasets
datasets.load_dataset("cais/mmlu", "all")   # will fail on any dataset

```
>>> datasets.load_dataset("cais/mmlu", "all")
Traceback (most recent call last):
  File "<python-input-2>", line 1, in <module>
    datasets.load_dataset("cais/mmlu", "all")
    ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^                                                                                                                                
  File "/Users/zmoshe/temp/test_datasets_py3.14/.venv/lib/python3.14/site-packages/datasets/load.py", line 1397, in load_dataset
    builder_instance = load_dataset_builder(                          
        path=path,                                                                                                                                                           
    ...<10 lines>...                                                               
        **config_kwargs,                     
    )                                                                                                                                                                        
  File "/Users/zmoshe/temp/test_datasets_py3.14/.venv/lib/python3.14/site-packages/datasets/load.py", line 1185, in load_dataset_builder
    builder_instance._use_legacy_cache_dir_if_possible(dataset_module)                                                                                                       
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^                                                                                                       
  File "/Users/zmoshe/temp/test_datasets_py3.14/.venv/lib/python3.14/site-packages/datasets/builder.py", line 615, in _use_legacy_cache_dir_if_possible
    self._check_legacy_cache2(dataset_module) or self._check_legacy_cache() or None
    ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^                                                                                                                                
  File "/Users/zmoshe/temp/test_datasets_py3.14/.venv/lib/python3.14/site-packages/datasets/builder.py", line 487, in _check_legacy_cache2
    config_id = self.config.name + "-" + Hasher.hash({"data_files": self.config.data_files})
                                         ~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                  
  File "/Users/zmoshe/temp/test_datasets_py3.14/.venv/lib/python3.14/site-packages/datasets/fingerprint.py", line 188, in hash
    return cls.hash_bytes(dumps(value))  
                          ~~~~~^^^^^^^                                                                                                                                       
  File "/Users/zmoshe/temp/test_datasets_py3.14/.venv/lib/python3.14/site-packages/datasets/utils/_dill.py", line 120, in dumps
    dump(obj, file)             
    ~~~~^^^^^^^^^^^                                                                                                                                                          
  File "/Users/zmoshe/temp/test_datasets_py3.14/.venv/lib/python3.14/site-packages/datasets/utils/_dill.py", line 114, in dump
    Pickler(file, recurse=True).dump(obj)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^                                                                                                                                    
  File "/Users/zmoshe/temp/test_datasets_py3.14/.venv/lib/python3.14/site-packages/dill/_dill.py", line 428, in dump
    StockPickler.dump(self, obj)                                       
    ~~~~~~~~~~~~~~~~~^^^^^^^^^^^                                                                                                                                             
  File "/Users/zmoshe/.local/uv/python/cpython-3.14.0rc2-macos-aarch64-none/lib/python3.14/pickle.py", line 498, in dump
    self.save(obj)                                  
    ~~~~~~~~~^^^^^                                                                                                                                                           
  File "/Users/zmoshe/temp/test_datasets_py3.14/.venv/lib/python3.14/site-packages/datasets/utils/_dill.py", line 70, in save
    dill.Pickler.save(self, obj, save_persistent_id=save_persistent_id)
    ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                                                                                      
  File "/Users/zmoshe/temp/test_datasets_py3.14/.venv/lib/python3.14/site-packages/dill/_dill.py", line 422, in save
    StockPickler.save(self, obj, save_persistent_id)
    ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^                                                                                                                         
  File "/Users/zmoshe/.local/uv/python/cpython-3.14.0rc2-macos-aarch64-none/lib/python3.14/pickle.py", line 572, in save
    f(self, obj)  # Call unbound method with explicit self
    ~^^^^^^^^^^^                                                                  
  File "/Users/zmoshe/temp/test_datasets_py3.14/.venv/lib/python3.14/site-packages/dill/_dill.py", line 1262, in save_module_dict
    StockPickler.save_dict(pickler, obj)                                                                                                                                     
    ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^
  File "/Users/zmoshe/.local/uv/python/cpython-3.14.0rc2-macos-aarch64-none/lib/python3.14/pickle.py", line 1064, in save_dict
    self._batch_setitems(obj.items(), obj)
    ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
TypeError: Pickler._batch_setitems() takes 2 positional arguments but 3 were given
```

### Expected behavior

should work.

### Environment info

datasets==v4.3.0
python==3.14


Comments:
Thanks for the report.
Have you tried on main? This should work, there was recently a PR merged to address this problem, see #7817

Works on main 👍 
What's the release schedule for `datasets`? Seems like a cadence of ~2weeks so I assume a real version is due pretty soon?

let's say we do a new release later today ? :)

Premium service! 
😂  👑 
Just checked 4.4.0 - works as expected!