Apr 3, 2025 · Apr 3, 2025 · Apr 3, 2025 · Apr 3, 2025 · Apr 4, 2025 · Apr 4, 2025
diff --git a/pandas/core/reshape/reshape.py b/pandas/core/reshape/reshape.py
            # setting nans back to nan to maintain the -1 values
            if self.lift:
                codes = [
                    factorize(np.where(code == -1,None, code))[0] for code in codes
                    factorize(np.where(code == -1,np.nan, code))[0] for code in codes
                ]
            else:
                codes = [factorize(code)[0] for code in codes]
Original file line number	Diff line number	Diff line change
Expand Up		@@ -177,7 +177,7 @@ def _indexer_and_to_sort(
		# setting nans back to nan to maintain the -1 values
		if self.lift:
		codes = [
		factorize(np.where(code == -1,None, code))[0] for code in codes
		factorize(np.where(code == -1,np.nan, code))[0] for code in codes
		]
		else:
		codes = [factorize(code)[0] for code in codes]
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