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ENH: pivot_annual with a better exception message #2019

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ENH: pivot_annual with a better exception message #2019

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2 changes: 1 addition & 1 deletion pandas/tseries/util.py
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Original file line number Diff line number Diff line change
Expand Up @@ -65,7 +65,7 @@ def pivot_annual(series, freq=None):
if not np.issubdtype(series.dtype, np.integer):
values.fill(np.nan)
else:
raise Exception('need to upcast')
raise Exception('need to upcast: convert dtype to -- which is necessary for the leap year adjustment.')

values.put(flat_index, series.values)

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