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BUG: Handle Series arguments in DataFrame.replace, fixes GH2994 #3064

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BUG: Handle Series arguments in DataFrame.replace, fixes GH2994 #3064

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10 changes: 5 additions & 5 deletions pandas/core/frame.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3427,8 +3427,8 @@ def replace(self, to_replace, value=None, method='pad', axis=0,

Parameters
----------
value : scalar or dict, default None
Value to use to fill holes (e.g. 0), alternately a dict of values
value : scalar or dict or Series, default None
Value to use to fill holes (e.g. 0), alternately a dict/Series of values
specifying which value to use for each column (columns not in the
dict will not be filled)
method : {'backfill', 'bfill', 'pad', 'ffill', None}, default 'pad'
Expand Down Expand Up @@ -3468,8 +3468,8 @@ def replace(self, to_replace, value=None, method='pad', axis=0,
return self

new_data = self._data
if isinstance(to_replace, dict):
if isinstance(value, dict): # {'A' : NA} -> {'A' : 0}
if isinstance(to_replace, (dict,Series)):
if isinstance(value, (dict,Series)): # {'A' : NA} -> {'A' : 0}
new_data = self._data
for c, src in to_replace.iteritems():
if c in value and c in self:
Expand Down Expand Up @@ -3501,7 +3501,7 @@ def replace(self, to_replace, value=None, method='pad', axis=0,
else:

# dest iterable dict-like
if isinstance(value, dict): # NA -> {'A' : 0, 'B' : -1}
if isinstance(value, (dict,Series)): # NA -> {'A' : 0, 'B' : -1}

new_data = self._data
for k, v in value.iteritems():
Expand Down
17 changes: 17 additions & 0 deletions pandas/tests/test_frame.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5786,6 +5786,23 @@ def test_replace_input_formats(self):
expected.replace(to_rep[i], -1, inplace=True)
assert_frame_equal(result, expected)

# scalar to series/dict
df = DataFrame({'zero': {'a': 0.0, 'b': 1}, 'one': {'a': 2.0, 'b': 0}})
result = df.replace(0, {'zero': 0.5, 'one': 1.0})
expected = DataFrame({'zero': {'a': 0.5, 'b': 1}, 'one': {'a': 2.0, 'b': 1.0}})
assert_frame_equal(result, expected)
result = df.replace(0, df.mean())
assert_frame_equal(result, expected)

# series to series/dict
df = DataFrame({'zero': {'a': 0.0, 'b': 1}, 'one': {'a': 2.0, 'b': 0}})
s = Series({'zero': 0.0, 'one': 2.0})
result = df.replace(s, {'zero': 0.5, 'one': 1.0})
expected = DataFrame({'zero': {'a': 0.5, 'b': 1}, 'one': {'a': 1.0, 'b': 0.0}})
assert_frame_equal(result, expected)
result = df.replace(s, df.mean())
assert_frame_equal(result, expected)

def test_replace_axis(self):
self.tsframe['A'][:5] = nan
self.tsframe['A'][-5:] = nan
Expand Down