Unable to use metpy.io.Level2File

[rolypolyman]

This single line produces the error "TypeError: Struct() takes at most 1 argument (3 given)":

from metpy.io import Level2File

I am running MetPy 1.5.2. I also cannot get the Unidata radar code samples or the MetPy Mondays 140 to work because they halt on this line as well. I am not fully up to speed on Python and am working strictly with examples, but when the examples fail it gets pretty confusing. I have searched around for this error but I can't figure it out.

Complete code sample and error:

from metpy.io import Level2File

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
Cell In[1], line 1
----> 1 from metpy.io import Level2File

File ~\miniconda3\envs\ForecastLab\Lib\site-packages\metpy\io\__init__.py:16
      4 """Tools for reading various file formats.
      5 
      6 Classes supporting formats are written to take both file names (for local files) or file-like
   (...)
     12 (e.g. latitude, longitude, altitude) from various sources.
     13 """
     15 from .gempak import *  # noqa: F403
---> 16 from .gini import *  # noqa: F403
     17 from .metar import *  # noqa: F403
     18 from .nexrad import *  # noqa: F403

File ~\miniconda3\envs\ForecastLab\Lib\site-packages\metpy\io\gini.py:69
     64     lambert_conformal = 3
     65     polar_stereographic = 5
     68 @exporter.export
---> 69 class GiniFile(AbstractDataStore):
     70     """A class that handles reading the GINI format satellite images from the NWS.
     71 
     72     This class attempts to decode every byte that is in a given GINI file.
   (...)
     77 
     78     """
     80     missing = 255

File ~\miniconda3\envs\ForecastLab\Lib\site-packages\metpy\io\gini.py:111, in GiniFile()
     87 sectors = ['NH Composite', 'East CONUS', 'West CONUS', 'Alaska Regional',
     88            'Alaska National', 'Hawaii Regional', 'Hawaii National', 'Puerto Rico Regional',
     89            'Puerto Rico National', 'Supernational', 'NH Composite', 'Central CONUS',
     90            'East Floater', 'West Floater', 'Central Floater', 'Polar Floater']
     92 channels = ['Unknown', 'Visible', 'IR (3.9 micron)', 'WV (6.5/6.7 micron)',
     93             'IR (11 micron)', 'IR (12 micron)', 'IR (13 micron)', 'IR (1.3 micron)',
     94             'Reserved', 'Reserved', 'Reserved', 'Reserved', 'Reserved', 'LI (Imager)',
   (...)
    108             # Percent Normal TPW found empirically from Service Change Notice 20-03
    109             'Sounder (3.74 micron)', 'Sounder (Visible)', 'Percent Normal TPW']
--> 111 prod_desc_fmt = NamedStruct([('source', 'b'),
    112                              ('creating_entity', 'b', _name_lookup(crafts)),
    113                              ('sector_id', 'b', _name_lookup(sectors)),
    114                              ('channel', 'b', _name_lookup(channels)),
    115                              ('num_records', 'H'), ('record_len', 'H'),
    116                              ('datetime', '7s', _make_datetime),
    117                              ('projection', 'b', GiniProjection), ('nx', 'H'), ('ny', 'H'),
    118                              ('la1', '3s', _scaled_int), ('lo1', '3s', _scaled_int)
    119                              ], '>', 'ProdDescStart')
    121 lc_ps_fmt = NamedStruct([('reserved', 'b'), ('lov', '3s', _scaled_int),
    122                          ('dx', '3s', _scaled_int), ('dy', '3s', _scaled_int),
    123                          ('proj_center', 'b')], '>', 'LambertOrPolarProjection')
    125 mercator_fmt = NamedStruct([('resolution', 'b'), ('la2', '3s', _scaled_int),
    126                             ('lo2', '3s', _scaled_int), ('di', 'H'), ('dj', 'H')
    127                             ], '>', 'MercatorProjection')

TypeError: Struct() takes at most 1 argument (3 given)

[dcamron]

This is an issue with MetPy + Python 3.12, and will be fixed in our imminent 1.6 release in the next week or two. In the mean time, running MetPy in an environment with "python<3.12" should work fine! Let us know if that's not the case.

[rolypolyman]

Oh no problem at all... I thought my installation was broken or there was something I wasn't understanding. As long as it's MetPy and not me. Thanks!