def test_no_copy_blocks(self):
# API/ENH 9607
df = DataFrame(self.frame, copy=True)
column = df.columns[0]
# use the copy=False, change a column
blocks = df.as_blocks(copy=False)
for dtype, _df in blocks.items():
if column in _df:
_df.loc[:, column] = _df[column] + 1
# make sure we did change the original DataFrame
assert _df[column].equals(df[column])
def test_no_copy_blocks(self):
# API/ENH 9607
df = DataFrame(self.frame, copy=True)
column = df.columns[0]
# use the copy=False, change a column
blocks = df.as_blocks(copy=False)
for dtype, _df in blocks.items():
if column in _df:
_df.loc[:, column] = _df[column] + 1
# make sure we did change the original DataFrame
self.assertTrue(_df[column].equals(df[column]))
def test_copy_blocks(self):
# API/ENH 9607
df = DataFrame(self.frame, copy=True)
column = df.columns[0]
# use the default copy=True, change a column
blocks = df.as_blocks()
for dtype, _df in blocks.items():
if column in _df:
_df.ix[:, column] = _df[column] + 1
# make sure we did not change the original DataFrame
self.assertFalse(_df[column].equals(df[column]))
def test_no_copy_blocks(self, float_frame):
# API/ENH 9607
df = DataFrame(float_frame, copy=True)
column = df.columns[0]
# use the copy=False, change a column
# deprecated 0.21.0
with tm.assert_produces_warning(FutureWarning, check_stacklevel=False):
blocks = df.as_blocks(copy=False)
for dtype, _df in blocks.items():
if column in _df:
_df.loc[:, column] = _df[column] + 1
# make sure we did change the original DataFrame
assert _df[column].equals(df[column])
def test_no_copy_blocks(self):
# API/ENH 9607
df = DataFrame(self.frame, copy=True)
column = df.columns[0]
# use the copy=False, change a column
# deprecated 0.21.0
with tm.assert_produces_warning(FutureWarning,
check_stacklevel=False):
blocks = df.as_blocks(copy=False)
for dtype, _df in blocks.items():
if column in _df:
_df.loc[:, column] = _df[column] + 1
# make sure we did change the original DataFrame
assert _df[column].equals(df[column])
