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pandas/core/arrays/categorical.py

Lines changed: 3 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -451,11 +451,9 @@ def from_dummies(
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"""
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from pandas import Series
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454-
copied = False
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to_drop = dummies.columns[isna(dummies.columns.values)]
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if len(to_drop):
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dummies = dummies.drop(columns=to_drop)
458-
copied = True
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if prefix is None:
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cats = dummies.columns
@@ -471,7 +469,7 @@ def from_dummies(
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df = dummies.astype("boolean")
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if fillna is not None:
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df = df.fillna(fillna, inplace=copied)
472+
df = df.fillna(fillna)
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row_totals = df.sum(axis=1, skipna=False)
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if row_totals.isna().any():
@@ -481,7 +479,8 @@ def from_dummies(
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if multicat_rows.any():
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raise ValueError(
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"{} record(s) belongs to multiple categories: {}".format(
484-
multicat_rows.sum(), list(df.index[multicat_rows]),
482+
multicat_rows.sum(),
483+
list(df.index[multicat_rows]),
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)
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)
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