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  • Raise nice error when attempting to concatenate CFTimeIndex & DatetimeIndex · 5 ✖

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571691258 https://github.com/pydata/xarray/issues/3666#issuecomment-571691258 https://api.github.com/repos/pydata/xarray/issues/3666 MDEyOklzc3VlQ29tbWVudDU3MTY5MTI1OA== dcherian 2448579 2020-01-07T17:35:51Z 2020-01-07T17:36:03Z MEMBER

@tlogan specifying use_cftime as True or False in the open_dataset call might be useful.

This suggests that the RecursionError in @keewis example is a result of trying to concatenate datasets with mixed DatetimeIndex & CFTimeIndex indexes. In [18]: files = glob.glob("*.nc") ...: datasets = [xr.open_dataset(file) for file in files] ...: xr.concat(datasets, dim="new_dim") RecursionError

 
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   Raise nice error when attempting to concatenate CFTimeIndex & DatetimeIndex 546303413
571667543 https://github.com/pydata/xarray/issues/3666#issuecomment-571667543 https://api.github.com/repos/pydata/xarray/issues/3666 MDEyOklzc3VlQ29tbWVudDU3MTY2NzU0Mw== keewis 14808389 2020-01-07T16:38:04Z 2020-01-07T16:38:04Z MEMBER

it does. Also, no errors in either case, so the problem is with DatetimeIndex, CFTimeIndex or the way the data is converted.

 
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   Raise nice error when attempting to concatenate CFTimeIndex & DatetimeIndex 546303413
571665270 https://github.com/pydata/xarray/issues/3666#issuecomment-571665270 https://api.github.com/repos/pydata/xarray/issues/3666 MDEyOklzc3VlQ29tbWVudDU3MTY2NTI3MA== dcherian 2448579 2020-01-07T16:33:06Z 2020-01-07T16:33:06Z MEMBER

I'm guessing decode_times=False will fix that bit.

 
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   Raise nice error when attempting to concatenate CFTimeIndex & DatetimeIndex 546303413
571639956 https://github.com/pydata/xarray/issues/3666#issuecomment-571639956 https://api.github.com/repos/pydata/xarray/issues/3666 MDEyOklzc3VlQ29tbWVudDU3MTYzOTk1Ng== keewis 14808389 2020-01-07T15:38:57Z 2020-01-07T15:38:57Z MEMBER

I can reproduce this error with your files: python In [18]: files = glob.glob("*.nc") ...: datasets = [xr.open_dataset(file) for file in files] ...: xr.concat(datasets, dim="new_dim") RecursionError but sorting the files before concatenating results in a different error: python In [19]: files = glob.glob("*.nc") ...: datasets = [xr.open_dataset(file) for file in sorted(files)] ...: xr.concat(datasets, dim="new_dim") TypeError: cannot compare cftime.DatetimeNoLeap(1950-01-01 00:00:00) and Timestamp('1950-01-01 00:00:00') (different calendars) which might mean that there is a problem with the data.

Regardless, we might want to make sure the recursion does not happen.

 
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   Raise nice error when attempting to concatenate CFTimeIndex & DatetimeIndex 546303413
571639751 https://github.com/pydata/xarray/issues/3666#issuecomment-571639751 https://api.github.com/repos/pydata/xarray/issues/3666 MDEyOklzc3VlQ29tbWVudDU3MTYzOTc1MQ== dcherian 2448579 2020-01-07T15:38:28Z 2020-01-07T15:38:28Z MEMBER

Thanks @tlogan2000.

Can you reduce this example to just a xarray.concat call?

 
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   Raise nice error when attempting to concatenate CFTimeIndex & DatetimeIndex 546303413

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