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make error message more clear #10994

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Merged
jsignell merged 2 commits into from
Dec 8, 2025
Merged

make error message more clear #10994

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1b3b737
make error message more clear
d-v-b Dec 8, 2025
fad54c8
improve error message and update tests
d-v-b Dec 8, 2025
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2 changes: 1 addition & 1 deletion xarray/coding/common.py
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Original file line number Diff line number Diff line change
Expand Up @@ -113,7 +113,7 @@ def safe_setitem(dest, key: Hashable, value, name: T_Name = None):
if key in dest:
var_str = f" on variable {name!r}" if name else ""
raise ValueError(
f"failed to prevent overwriting existing key {key} in attrs{var_str}. "
f"Key {key} already exists in attrs{var_str}, and will not be overwritten. "
"This is probably an encoding field used by xarray to describe "
"how a variable is serialized. To proceed, remove this key from "
"the variable's attributes manually."
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