On Windows, Herbie can't remove subset file

[blaylockbk]

When I open a subset from with xarray, Herbie tries to remove the file if it didn't exist before (some basic clean up). But this doesn't work on Windows

H = Herbie(
    "2021-10-9",
    model="hrrr",
    product="prs",
)

ds = H.xarray('^TMP:2 m')

PermissionError: [WinError 32] 
The process cannot access the file because it is being used by another process: 
'C:\\Users\\blayl_depgywe\\data\\hrrr\\20211009\\hrrr.t00z.wrfprsf00.grib2.subset_8746b7e5d534efa196e92e53c61ec747f4c936a5'

The offending line is Line 761: local_file.unlink() # Removes file

[blaylockbk]

Hmmm, the cfgrib.open_datasets doesn't make it easy to close the file.

[blaylockbk]

It was also reported that the init.py is not creating the config file.

So, is this a Windows issue or a Python 3.9 on Windows issue?

[blaylockbk]

Perhaps all I need is a os.close(local_file) statement

[blaylockbk]

Agh, still trying to figure this out.

https://docs.python.org/3/library/os.html#os.remove On Windows, attempting to remove a file that is in use causes an exception to be raised; on Unix, the directory entry is removed but the storage allocated to the file is not made available until the original file is no longer in use.

[blaylockbk]

I might have found a solution...use xr.load_dataset instead. This loads the data into memory and closes the file.

https://docs.xarray.dev/en/stable/generated/xarray.load_dataset.html

[blaylockbk]

Oh wow. How did I miss this one...I simply forgot to close the file opened by pygrib. Well, 2785b61 seems to have fixed this one. I'll do a bit more testing, but I'm certain this is resolved.