fix

Author: h-vetinari

pandas/core/generic.py

@@ -764,7 +764,7 @@ def set_index(self, keys, drop=True, append=False, inplace=False,
             elif isinstance(col, (list, np.ndarray)):
                 arrays.append(col)
                 names.append(None)
-            # from here, col can only be a column label (and self a DataFrame);
+            # from here, col can only be a column label (and obj a DataFrame);
             # see checks in Series.set_index and DataFrame.set_index
             else:
                 arrays.append(obj[col]._values)