def test_str_label_slicing_with_negative_step(self, idx):
SLC = pd.IndexSlice
idx = Index(idx)
ser = Series(np.arange(20), index=idx)
tm.assert_indexing_slices_equivalent(ser, SLC[idx[9] :: -1], SLC[9::-1])
tm.assert_indexing_slices_equivalent(ser, SLC[: idx[9] : -1], SLC[:8:-1])
tm.assert_indexing_slices_equivalent(
ser, SLC[idx[13] : idx[9] : -1], SLC[13:8:-1]
)
tm.assert_indexing_slices_equivalent(ser, SLC[idx[9] : idx[13] : -1], SLC[:0])
def test_slice_with_negative_step(index):
keystr1 = str(index[9])
keystr2 = str(index[13])
ser = Series(np.arange(20), index)
SLC = IndexSlice
for key in [keystr1, index[9]]:
tm.assert_indexing_slices_equivalent(ser, SLC[key::-1], SLC[9::-1])
tm.assert_indexing_slices_equivalent(ser, SLC[:key:-1], SLC[:8:-1])
for key2 in [keystr2, index[13]]:
tm.assert_indexing_slices_equivalent(ser, SLC[key2:key:-1], SLC[13:8:-1])
tm.assert_indexing_slices_equivalent(ser, SLC[key:key2:-1], SLC[0:0:-1])
def test_str_label_slicing_with_negative_step(self):
SLC = pd.IndexSlice
for idx in [
_mklbl("A", 20),
np.arange(20) + 100,
np.linspace(100, 150, 20)
]:
idx = Index(idx)
ser = Series(np.arange(20), index=idx)
tm.assert_indexing_slices_equivalent(ser, SLC[idx[9]::-1],
SLC[9::-1])
tm.assert_indexing_slices_equivalent(ser, SLC[:idx[9]:-1],
SLC[:8:-1])
tm.assert_indexing_slices_equivalent(ser, SLC[idx[13]:idx[9]:-1],
SLC[13:8:-1])
tm.assert_indexing_slices_equivalent(ser, SLC[idx[9]:idx[13]:-1],
SLC[:0])
def test_multiindex_label_slicing_with_negative_step(self):
ser = Series(np.arange(20),
MultiIndex.from_product([list("abcde"),
np.arange(4)]))
SLC = pd.IndexSlice
tm.assert_indexing_slices_equivalent(ser, SLC[::-1], SLC[::-1])
tm.assert_indexing_slices_equivalent(ser, SLC["d"::-1], SLC[15::-1])
tm.assert_indexing_slices_equivalent(ser, SLC[("d", )::-1],
SLC[15::-1])
tm.assert_indexing_slices_equivalent(ser, SLC[:"d":-1], SLC[:11:-1])
tm.assert_indexing_slices_equivalent(ser, SLC[:("d", ):-1],
SLC[:11:-1])
tm.assert_indexing_slices_equivalent(ser, SLC["d":"b":-1],
SLC[15:3:-1])
tm.assert_indexing_slices_equivalent(ser, SLC[("d", ):"b":-1],
SLC[15:3:-1])
tm.assert_indexing_slices_equivalent(ser, SLC["d":("b", ):-1],
SLC[15:3:-1])
tm.assert_indexing_slices_equivalent(ser, SLC[("d", ):("b", ):-1],
SLC[15:3:-1])
tm.assert_indexing_slices_equivalent(ser, SLC["b":"d":-1], SLC[:0])
tm.assert_indexing_slices_equivalent(ser, SLC[("c", 2)::-1],
SLC[10::-1])
tm.assert_indexing_slices_equivalent(ser, SLC[:("c", 2):-1],
SLC[:9:-1])
tm.assert_indexing_slices_equivalent(ser, SLC[("e", 0):("c", 2):-1],
SLC[16:9:-1])