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improve error message for invalid encoding #2730

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Merged
merged 1 commit into from
Jan 31, 2019
Merged

improve error message for invalid encoding #2730

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5 changes: 3 additions & 2 deletions xarray/backends/netCDF4_.py
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Original file line number Diff line number Diff line change
Expand Up @@ -221,8 +221,9 @@ def _extract_nc4_variable_encoding(variable, raise_on_invalid=False,
if raise_on_invalid:
invalid = [k for k in encoding if k not in valid_encodings]
if invalid:
raise ValueError('unexpected encoding parameters for %r backend: '
' %r' % (backend, invalid))
raise ValueError(
'unexpected encoding parameters for %r backend: %r. Valid '
'encodings are: %r' % (backend, invalid, valid_encodings))
else:
for k in list(encoding):
if k not in valid_encodings:
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