issues: 1401909544

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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
1401909544 I_kwDOAMm_X85Tj3Eo 7145 Time decoding error message does not include the problematic variable's name 6628425 closed 0     5 2022-10-08T10:59:17Z 2022-10-13T23:21:55Z 2022-10-12T15:25:42Z MEMBER      

What is your issue?

If any variable in a Dataset has times that cannot be represented as cftime.datetime objects, an error message will be raised. However, this error message will not indicate the problematic variable's name. It would be nice if it did, because it would make it easier for users to determine the source of the error.

cc: @durack1 xref: Unidata/cftime#295

Example

This is a minimal example of the issue. The error message gives no indication that "invalid_times" is the problem:

```

import xarray as xr TIME_ATTRS = {"units": "days since 0001-01-01", "calendar": "noleap"} valid_times = xr.DataArray([0, 1], dims=["time"], attrs=TIME_ATTRS, name="valid_times") invalid_times = xr.DataArray([1e36, 2e36], dims=["time"], attrs=TIME_ATTRS, name="invalid_times") ds = xr.merge([valid_times, invalid_times]) xr.decode_cf(ds) Traceback (most recent call last): File "/Users/spencer/software/xarray/xarray/coding/times.py", line 275, in decode_cf_datetime dates = _decode_datetime_with_pandas(flat_num_dates, units, calendar) File "/Users/spencer/software/xarray/xarray/coding/times.py", line 210, in _decode_datetime_with_pandas raise OutOfBoundsDatetime( pandas._libs.tslibs.np_datetime.OutOfBoundsDatetime: Cannot decode times from a non-standard calendar, 'noleap', using pandas.

During handling of the above exception, another exception occurred:

Traceback (most recent call last): File "/Users/spencer/software/xarray/xarray/coding/times.py", line 180, in _decode_cf_datetime_dtype result = decode_cf_datetime(example_value, units, calendar, use_cftime) File "/Users/spencer/software/xarray/xarray/coding/times.py", line 277, in decode_cf_datetime dates = _decode_datetime_with_cftime( File "/Users/spencer/software/xarray/xarray/coding/times.py", line 202, in _decode_datetime_with_cftime cftime.num2date(num_dates, units, calendar, only_use_cftime_datetimes=True) File "src/cftime/_cftime.pyx", line 605, in cftime._cftime.num2date File "src/cftime/_cftime.pyx", line 404, in cftime._cftime.cast_to_int OverflowError: time values outside range of 64 bit signed integers

During handling of the above exception, another exception occurred:

Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/Users/spencer/software/xarray/xarray/conventions.py", line 655, in decode_cf vars, attrs, coord_names = decode_cf_variables( File "/Users/spencer/software/xarray/xarray/conventions.py", line 521, in decode_cf_variables new_vars[k] = decode_cf_variable( File "/Users/spencer/software/xarray/xarray/conventions.py", line 369, in decode_cf_variable var = times.CFDatetimeCoder(use_cftime=use_cftime).decode(var, name=name) File "/Users/spencer/software/xarray/xarray/coding/times.py", line 687, in decode dtype = _decode_cf_datetime_dtype(data, units, calendar, self.use_cftime) File "/Users/spencer/software/xarray/xarray/coding/times.py", line 190, in _decode_cf_datetime_dtype raise ValueError(msg) ValueError: unable to decode time units 'days since 0001-01-01' with "calendar 'noleap'". Try opening your dataset with decode_times=False or installing cftime if it is not installed. ```

 
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