Title: np.fromfile not supported
Author: d710055071 (CONTRIBUTOR)
State: open
Created: 2024-01-12T09:46:17Z

How to do np.fromfile  to use it like np.load


```python
def xnumpy_fromfile(filepath_or_buffer, *args, download_config: Optional[DownloadConfig] = None, **kwargs):
    import numpy as np

    if hasattr(filepath_or_buffer, "read"):
        return np.fromfile(filepath_or_buffer, *args, **kwargs)
    else:
        filepath_or_buffer = str(filepath_or_buffer)
        return np.fromfile(xopen(filepath_or_buffer, "rb", download_config=download_config).read(), *args, **kwargs)
```
this is not work

Comments:
@lhoestq
Can you provide me with some ideas？

Hi ! What's the error ?

@lhoestq 
```
Traceback (most recent call last):
  File "/home/dongzf/miniconda3/envs/dataset_ai/lib/python3.11/runpy.py", line 198, in _run_module_as_main
    return _run_code(code, main_globals, None,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/dongzf/miniconda3/envs/dataset_ai/lib/python3.11/runpy.py", line 88, in _run_code
    exec(code, run_globals)
  File "/home/dongzf/.vscode/extensions/ms-python.python-2023.22.1/pythonFiles/lib/python/debugpy/adapter/../../debugpy/launcher/../../debugpy/__main__.py", line 39, in <module>
    cli.main()
  File "/home/dongzf/.vscode/extensions/ms-python.python-2023.22.1/pythonFiles/lib/python/debugpy/adapter/../../debugpy/launcher/../../debugpy/../debugpy/server/cli.py", line 430, in main
    run()
  File "/home/dongzf/.vscode/extensions/ms-python.python-2023.22.1/pythonFiles/lib/python/debugpy/adapter/../../debugpy/launcher/../../debugpy/../debugpy/server/cli.py", line 284, in run_file
    runpy.run_path(target, run_name="__main__")
  File "/home/dongzf/.vscode/extensions/ms-python.python-2023.22.1/pythonFiles/lib/python/debugpy/_vendored/pydevd/_pydevd_bundle/pydevd_runpy.py", line 321, in run_path
    return _run_module_code(code, init_globals, run_name,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/dongzf/.vscode/extensions/ms-python.python-2023.22.1/pythonFiles/lib/python/debugpy/_vendored/pydevd/_pydevd_bundle/pydevd_runpy.py", line 135, in _run_module_code
    _run_code(code, mod_globals, init_globals,
  File "/home/dongzf/.vscode/extensions/ms-python.python-2023.22.1/pythonFiles/lib/python/debugpy/_vendored/pydevd/_pydevd_bundle/pydevd_runpy.py", line 124, in _run_code
    exec(code, run_globals)
  File "/mnt/sda/code/dataset_ai/dataset_ai/example/test.py", line 83, in <module>
    data = xnumpy_fromfile(current_dir, download_config=config,dtype=numpy.float32,)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/mnt/sda/code/dataset_ai/dataset_ai/src/datasets/download/streaming_download_manager.py", line 765, in xnumpy_fromfile
    return np.fromfile(xopen(filepath_or_buffer, "rb", download_config=download_config).read(), *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ValueError: embedded null byte
```

    not add read() 
the error is 

return np.fromfile(xopen(filepath_or_buffer, "rb", download_config=download_config), *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
io.UnsupportedOperation: fileno

xopen return obj do not have fileno function
I don't know why?

I used this method to read point cloud data in the script


```python
with open(velodyne_filepath,"rb") as obj:
    velodyne_data = numpy.frombuffer(obj.read(), dtype=numpy.float32).reshape([-1, 4])
```