blosc2.pack_array#

blosc2.pack_array(arr: ndarray, clevel: int = 9, filter: Filter = Filter.SHUFFLE, codec: Codec = Codec.BLOSCLZ) → str | bytes#

Pack (compress) a NumPy array. It is equivalent to the pack function.

Parameters:

  • arr (np.ndarray) – The NumPy array to be packed.

  • clevel (int (optional)) – The compression level from 0 (no compression) to 9 (maximum compression). The default is 9.

  • filter (Filter (optional)) – The filter to be applied during compression. The default is Filter.SHUFFLE.

  • codec (Codec (optional)) – The codec to be used for compression. The default is Codec.BLOSCLZ.

Returns:

out – The packed array in the form of a Python str or bytes object.

Return type:

str or bytes

Raises:

  • AttributeError – If arr does not have an itemsize attribute. If arr does not have a size attribute.

  • ValueError – If typesize is not within the allowed range. If the pickled object size is larger than the maximum allowed buffer size. If clevel is not within the allowed range. If codec is not within the supported compressors.

See also

pack()

Examples

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