RepresenterError while writing a sample file

[vmarkovtsev]

The following code crashes on 2.3.0 for me:

asdf.AsdfFile(tree={"a": 1}).write_to("/tmp/1.asdf")

with

RepresenterError: cannot represent an object: {'history': {'extensions': []}, 'a': 1, 'asdf_library': {'name': 'asdf', 'author': 'Space Telescope Science Institute', 'version': '2.3.0', 'homepage': 'http://github.com/spacetelescope/asdf'}}

I run Python 3.5.

[drdavella]

I can't reproduce this in a new conda environment using Py35. Is it possible that you have another version of ASDF installed in the same environment? Maybe in development mode from a source checkout?

[vmarkovtsev]

I can reproduce it neither now... Most likely this is a weird glitch in my environment. Closing. I will reopen if we get this error again.

[xkortex]

I just got this error in an ipynb, running macOS 10.15.7 (19H1419), Intel Core i9, py-3.8.10, asdf-2.8.2. In my case, I was using imageio.imread to get an array from an image, and then asdf.AsdfFile({'img': img}).write_to(os.path.expanduser('~/tmp/junk.asdf')) (note: imageio actually returns a subclass of ndarray, <class 'imageio.core.util.Array'>) . I re-ran the notebook and it completely went away.

I wasn't doing anything super strange in this notebook, though I did try to parse some buffers which were corrupted, leading to ValueError: Input object does not appear to be an ASDF file or a FITS with ASDF extension, as expected.

Here's my imports:

import os
import json
import yaml
from pathlib import Path
import io

import PIL
import imageio
import numpy as np
import pandas as pd
from see import see

Unfortunately I lost the full traceback when I reset. I wish this error report was more insightful. I know how frustrating it is to track down Heisenbugs, so I hope this is at least a datapoint of "hey there is this transient error that occurs sometimes. Resetting state seems to fix it".

[eslavich]

Thanks for the new clues on this @xkortex (and for excavating the right issue to attach them to!). I'll reopen the issue and at some point see if I can figure out how to reproduce.

[braingram]

Testing this with the current development ASDF (3.0) I'm not seeing any issue serializing and deserializing the result of imageio.imread. Given this and the age of the issue I'm going to close this for now. Feel free to reopen this if the error reoccurs.