blosc2.pack_array2#

blosc2.pack_array2(arr, chunksize=None, **kwargs)#

Pack (compress) a NumPy array. This is faster, and it does not have a 2 GB limitation.

Parameters:

arr¶ (ndarray) – The NumPy array to be packed.
chunksize¶ (int) – The size (in bytes) for the chunks during compression. If not provided, it is computed automatically.
kwargs¶ (dict, optional) – These are the same as the kwargs in SChunk.__init__.

Returns:

out – The serialized version (cframe) of the array. If urlpath is provided, the number of bytes in file is returned instead.

Return type:

bytes | int

Examples

>>> import numpy as np
>>> a = np.arange(1e6)
>>> cframe = blosc2.pack_array2(a)
>>> len(cframe) < a.size * a.itemsize
True