Hi all,

Is yt-swift a full fork of yt, or just a plugin? It it’s a fork and there is an 
issue with the swift frontend in the main repo we would be happy to figure out 
how to fix it. 

If it’s a frontend plugin we should remove the existing in-repo frontend and 
have folks load via the plugin. 

Either way, it’s not good for the main repo to have buggy behavior that is 
fixed elsewhere but it’s not broadly known. We’d also want people using the 
swift frontend to benefit from other, more general bugs we find.

Best,

John

> On Jan 10, 2024, at 3:20 PM, Romeel Davé <[email protected]> wrote:
> 
> 
> Yeah it doesn’t work.  I use this version of yt from Doug Rennehan:
> https://github.com/rennehan/yt-swift
> 
> Cheers,
> romeel
> 
> 
>> On 10 Jan 2024, at 18:25, hannah.obrennan.2021--- via yt-users 
>> <[email protected]> wrote:
>> 
>> Has anyone recently been able to load a SWIFT snapshot using yt.load?
>> 
>> I created a conda env using python=3.
>> I installed the latest version of yt using: conda install -c conda-forge yt
>> I installed h5py using: conda install h5py
>> I also installed yt_astro_analysis (to use HaloCatalog later) using: git 
>> clone https://github.com/yt-project/yt_astro_analysis; cd yt_astro_analysis; 
>> python -m pip install -e .
>> 
>> I attempted to create a Dataset using yt.load("SWIFT_filename.hdf5") and 
>> found the following error:
>> 
>> Traceback (most recent call last):
>> File 
>> "/data/regan_data/Hannah_WS/Halo_mass_function_project/2023-10_11_12/FOF_Rockstar_comparison/hc_creation.py",
>>  line 62, in <module>
>>   data_ds = yt.load(dir_name)
>>             ^^^^^^^^^^^^^^^^^
>> File 
>> "/home/hannah/anaconda3/envs/yt-10_01_2024/lib/python3.12/site-packages/yt/_maintenance/deprecation.py",
>>  line 69, in inner
>>   return func(*args, **kwargs)
>>          ^^^^^^^^^^^^^^^^^^^^^
>> File 
>> "/home/hannah/anaconda3/envs/yt-10_01_2024/lib/python3.12/site-packages/yt/loaders.py",
>>  line 144, in load
>>   return cls(fn, *args, **kwargs)
>>          ^^^^^^^^^^^^^^^^^^^^^^^^
>> File 
>> "/home/hannah/anaconda3/envs/yt-10_01_2024/lib/python3.12/site-packages/yt/frontends/swift/data_structures.py",
>>  line 36, in __init__
>>   super().__init__(
>> File 
>> "/home/hannah/anaconda3/envs/yt-10_01_2024/lib/python3.12/site-packages/yt/frontends/sph/data_structures.py",
>>  line 34, in __init__
>>   super().__init__(
>> File 
>> "/home/hannah/anaconda3/envs/yt-10_01_2024/lib/python3.12/site-packages/yt/data_objects/static_output.py",
>>  line 2123, in __init__
>>   super().__init__(
>> File 
>> "/home/hannah/anaconda3/envs/yt-10_01_2024/lib/python3.12/site-packages/yt/data_objects/static_output.py",
>>  line 293, in __init__
>>   self._parse_parameter_file()
>> File 
>> "/home/hannah/anaconda3/envs/yt-10_01_2024/lib/python3.12/site-packages/yt/frontends/swift/data_structures.py",
>>  line 100, in _parse_parameter_file
>>   runtime_parameters = self._get_info_attributes("RuntimePars")
>>                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>> File 
>> "/home/hannah/anaconda3/envs/yt-10_01_2024/lib/python3.12/site-packages/yt/frontends/swift/data_structures.py",
>>  line 84, in _get_info_attributes
>>   header = dict(handle[dataset].attrs)
>>                 ~~~~~~^^^^^^^^^
>> File "h5py/_objects.pyx", line 54, in h5py._objects.with_phil.wrapper
>> File "h5py/_objects.pyx", line 55, in h5py._objects.with_phil.wrapper
>> File 
>> "/home/hannah/anaconda3/envs/yt-10_01_2024/lib/python3.12/site-packages/h5py/_hl/group.py",
>>  line 357, in __getitem__
>>   oid = h5o.open(self.id, self._e(name), lapl=self._lapl)
>>         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>> File "h5py/_objects.pyx", line 54, in h5py._objects.with_phil.wrapper
>> File "h5py/_objects.pyx", line 55, in h5py._objects.with_phil.wrapper
>> File "h5py/h5o.pyx", line 190, in h5py.h5o.open
>> KeyError: "Unable to open object (object 'RuntimePars' doesn't exist)"
>> 
>> 
>> When I examine the keys from the .hdf5 file in python, I find:
>> 
>>>>> import h5py
>>>>> f = h5py.File('../SWIFT__0.5_cMpc_h/N_512/RedshiftOutput0002.hdf5')
>>>>> list(f.keys())
>> ['Cells', 'Code', 'Cosmology', 'DMParticles', 'GravityScheme', 'Header', 
>> 'InternalCodeUnits', 'Parameters', 'PartType1', 'PhysicalConstants', 
>> 'Policy', 'SubgridScheme', 'Units', 'UnusedParameters']
>> 
>> 'RuntimePars' is not one of the keys listed.
>> 
>> Strangely, I was able to load the snapshot successfully on 12/12/2023 but 
>> cannot now, nor can I load any others.
>> This is the same error found by Romeel Davé (January 2022) in 
>> https://mail.python.org/archives/list/[email protected]/message/NUKRAWV7JEXSSJ4QEOOP2IOVMW4JXF4H/
>> 
>> Any help with would be much appreciated, thank you!
>> - Hannah
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