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BUG: fix .iat assignment creates a new column #24495

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Merged
merged 3 commits into from
Dec 30, 2018
Merged

BUG: fix .iat assignment creates a new column #24495

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9515bb7
BUG: fix .iat assignment creates a new column
RoeiRaz Dec 30, 2018
2a38d83
adds tests and whatsnew entry to #9515bb7
RoeiRaz Dec 30, 2018
486c25d
changes test to use assert_frame_equal()
RoeiRaz Dec 30, 2018
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5 changes: 4 additions & 1 deletion pandas/core/frame.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2716,7 +2716,10 @@ def _set_value(self, index, col, value, takeable=False):
except (KeyError, TypeError):

# set using a non-recursive method & reset the cache
self.loc[index, col] = value
if takeable:
self.iloc[index, col] = value
else:
self.loc[index, col] = value
self._item_cache.pop(col, None)

return self
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