Merge branch 'cow' into 'develop'

enable pandas copy_on_write

See merge request !796

saqc/core/core.py

@@ -12,7 +12,7 @@ import warnings
 from copy import copy as shallowcopy
 from copy import deepcopy
 from functools import partial
-from typing import Any, Hashable, Iterable, MutableMapping, overload
+from typing import Any, Hashable, Iterable, MutableMapping
 
 import numpy as np
 import pandas as pd
@@ -32,7 +32,7 @@ from saqc.funcs import FunctionsMixin
 
 # warnings
 pd.set_option("mode.chained_assignment", "warn")
-pd.options.mode.copy_on_write = False
+pd.set_option("mode.copy_on_write", True)
 np.seterr(invalid="ignore")
 
 

tests/core/test_flags.py

@@ -122,7 +122,7 @@ def test_copy(data: Union[pd.DataFrame, DictOfSeries, Dict[str, pd.Series]]):
 
     # the underling series data is the same
     for c in shallow.columns:
-        assert shallow._data[c].index is flags._data[c].index
+        assert shallow._data[c].index.equals(flags._data[c].index)
 
     # the underling series data was copied
     for c in deep.columns:

tests/core/test_history.py

@@ -143,7 +143,7 @@ def test_copy(data):
     assert is_equal(deep, shallow)
 
     # underling pandas data was only copied with deep=True
-    assert shallow.hist.index is hist.hist.index
+    assert shallow.hist.index.equals(hist.hist.index)
     assert deep.hist.index is not hist.hist.index