Hacktoberfest 2026: los issues que los mantenedores marcaron para octubre, abiertos y aptos para principiantes. Explorar issues de Hacktoberfest

Error in cf.write when writing UM data fields

Abierto
  • ¿Algo no está bien?
#838 12 comentarios 0 reacciones 0 asignados Ver en GitHub

Nadie ha tomado este issue todavía.

Evaluación

Dificultad
4/5
Tiempo estimado
3-5 días
Aptitud para principiantes
35/100
Tipo de issue
Error
Claridad
Bastante claro
Estado de actividad
Estancado
Stack tecnológico
python
Área
data

Línea de trabajo

Reproduce el problema con el archivo UM y un ejemplo mínimo de cf.read/cf.write. Empieza en cf/read_write/write.py y en la ruta cfdm netcdfwrite.py _write_global_attributes indicada en el traceback; después determina por qué los valores de los atributos globales contienen un dict no hashable. Se considera completado cuando el campo UM se escribe correctamente sin este TypeError.

Escrito por el modelo de indexación a partir del texto del issue.

Descripción

question um/pp

Hi folks. I'm encountering issues again with processing UM data. It's a related task to ticket #817 but a different error so I figured I'd start a new topic.

I can load in a single file (either on a surface level, UM tiles, or pressure levels) with no problem and perform usual cf-python tasks like amending and adding attributes, but when it comes to writing the file I get an unhashable type error as follows:

>>> cf.write(f[0], 'test.nc')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/apps/jasmin/jaspy/miniforge_envs/jaspy3.11/mf3-23.11.0-0/envs/jaspy3.11-mf3-23.11.0-0-v20240815/lib/python3.11/site-packages/cfdm/decorators.py", line 171, in verbose_override_wrapper
    return method_with_verbose_kwarg(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/apps/jasmin/jaspy/miniforge_envs/jaspy3.11/mf3-23.11.0-0/envs/jaspy3.11-mf3-23.11.0-0-v20240815/lib/python3.11/site-packages/cf/read_write/write.py", line 808, in write
    netcdf.write(
  File "/apps/jasmin/jaspy/miniforge_envs/jaspy3.11/mf3-23.11.0-0/envs/jaspy3.11-mf3-23.11.0-0-v20240815/lib/python3.11/site-packages/cfdm/decorators.py", line 171, in verbose_override_wrapper
    return method_with_verbose_kwarg(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/apps/jasmin/jaspy/miniforge_envs/jaspy3.11/mf3-23.11.0-0/envs/jaspy3.11-mf3-23.11.0-0-v20240815/lib/python3.11/site-packages/cfdm/read_write/netcdf/netcdfwrite.py", line 4911, in write
    self._file_io_iteration(
  File "/apps/jasmin/jaspy/miniforge_envs/jaspy3.11/mf3-23.11.0-0/envs/jaspy3.11-mf3-23.11.0-0-v20240815/lib/python3.11/site-packages/cfdm/read_write/netcdf/netcdfwrite.py", line 5153, in _file_io_iteration
    self._write_global_attributes(fields)
  File "/apps/jasmin/jaspy/miniforge_envs/jaspy3.11/mf3-23.11.0-0/envs/jaspy3.11-mf3-23.11.0-0-v20240815/lib/python3.11/site-packages/cfdm/read_write/netcdf/netcdfwrite.py", line 4289, in _write_global_attributes
    force_global = {
                   ^
  File "/apps/jasmin/jaspy/miniforge_envs/jaspy3.11/mf3-23.11.0-0/envs/jaspy3.11-mf3-23.11.0-0-v20240815/lib/python3.11/site-packages/cfdm/read_write/netcdf/netcdfwrite.py", line 4292, in <dictcomp>
    if len(v) == len(fields) and len(set(v)) == 1
                                     ^^^^^^
TypeError: unhashable type: 'dict'

I've managed to process hourly and daily files with this workflow and v similar code with no problem so far. I've also double-checked that all the files I'm currently trying to process here are fully formed and compliant, so that's not the issue (I think this was the main problem in my previous ticket).

I have also tested this behaviour with a MWE, where I load a UM file and then try to write it to netcdf, and the same occurs, i.e.

f = cf.read('/path/to/file/UM_file')
cf.write(f[0], 'test.nc')

Can you help me understand what's going on here? I am able to save the fields in iris without a problem, so it doesn't seem to be packing or underlying file problem, but I'd like to use cf-python to maintain consistency with the other files I've post-processed with this method.

Lenguaje dominante
Python
Estrellas
151
Forks
23
Merge medio
1 d 2 h
PR fusionados (30 d)
1

Preparar el entorno

Primeros pasos

  1. Lee el issue completo y luego la guía de contribución del proyecto.
  2. Comenta en el issue que vas a ocuparte — evita que dos personas hagan lo mismo.
  3. Haz un fork del repositorio y trabaja en una rama.
  4. Abre un pull request que haga referencia al número del issue.

Más de NCAS-CMS/cf-python

Todos los issues de NCAS-CMS/cf-python

Issues similares

Más issues de Python

Recibe los nuevos issues en tu correo

Un resumen breve de issues de GitHub para principiantes.