Changing compression parameter in python-blosc2

Question

I wanted to test out python-blosc2.

When trying do compress data with a user-defined Filter however, I stumbled across a for me unexplainable error.


import blosc2  
import numpy as np

a = np.random.rand(1000, 1000)

blosc2.compress(a, codec='blosclz', clevel=5, filter=blosc2.Filter.SHUFFLE)

I receive a AttributeError: 'str' object has no attribute 'name'

as the documentation said, one should pass the `enum blosc2.Filter` as argument. However, I tried multiple ways, including (but receiving the same error):

blosc2.compress(a, codec='blosclz', clevel=5, filter=blosc2.Filter(0))

I did miss, to uses the enum objects insted of the string for as also pointed out in the documentation.

Ivan · Accepted Answer · 2023-06-08 14:52:40Z

1

Looks like, your code fails here. According to the source code of core.py, codec is not supposed to be str type. You should pass a value of blosc2.Codec:

blosc2.compress(a, codec=blosc2.Codec.BLOSCLZ, clevel=5, filter=blosc2.Filter.SHUFFLE)

answered Jun 8, 2023 at 14:52

Ivan

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1 Comment

Helmut Over a year ago

yep, that was it! Thanks! Don't know, why I had the wrong line in the error trace…

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