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test_engines.py
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import re
import numpy as np
import pytest
from pandas._libs import index as libindex
import pandas as pd
@pytest.fixture(
params=[
(libindex.Int64Engine, np.int64),
(libindex.Int32Engine, np.int32),
(libindex.Int16Engine, np.int16),
(libindex.Int8Engine, np.int8),
(libindex.UInt64Engine, np.uint64),
(libindex.UInt32Engine, np.uint32),
(libindex.UInt16Engine, np.uint16),
(libindex.UInt8Engine, np.uint8),
(libindex.Float64Engine, np.float64),
(libindex.Float32Engine, np.float32),
],
ids=lambda x: x[0].__name__,
)
def numeric_indexing_engine_type_and_dtype(request):
return request.param
class TestDatetimeEngine:
@pytest.mark.parametrize(
"scalar",
[
pd.Timedelta(pd.Timestamp("2016-01-01").asm8.view("m8[ns]")),
pd.Timestamp("2016-01-01").value,
pd.Timestamp("2016-01-01").to_pydatetime(),
pd.Timestamp("2016-01-01").to_datetime64(),
],
)
def test_not_contains_requires_timestamp(self, scalar):
dti1 = pd.date_range("2016-01-01", periods=3)
dti2 = dti1.insert(1, pd.NaT) # non-monotonic
dti3 = dti1.insert(3, dti1[0]) # non-unique
dti4 = pd.date_range("2016-01-01", freq="ns", periods=2_000_000)
dti5 = dti4.insert(0, dti4[0]) # over size threshold, not unique
msg = "|".join([re.escape(str(scalar)), re.escape(repr(scalar))])
for dti in [dti1, dti2, dti3, dti4, dti5]:
with pytest.raises(TypeError, match=msg):
scalar in dti._engine
with pytest.raises(KeyError, match=msg):
dti._engine.get_loc(scalar)
class TestTimedeltaEngine:
@pytest.mark.parametrize(
"scalar",
[
# error: Argument 1 to "Timestamp" has incompatible type "timedelta64";
# expected "Union[integer[Any], float, str, date, datetime64]"
pd.Timestamp(pd.Timedelta(days=42).asm8.view("datetime64[ns]")),
pd.Timedelta(days=42).value,
pd.Timedelta(days=42).to_pytimedelta(),
pd.Timedelta(days=42).to_timedelta64(),
],
)
def test_not_contains_requires_timedelta(self, scalar):
tdi1 = pd.timedelta_range("42 days", freq="9h", periods=1234)
tdi2 = tdi1.insert(1, pd.NaT) # non-monotonic
tdi3 = tdi1.insert(3, tdi1[0]) # non-unique
tdi4 = pd.timedelta_range("42 days", freq="ns", periods=2_000_000)
tdi5 = tdi4.insert(0, tdi4[0]) # over size threshold, not unique
msg = "|".join([re.escape(str(scalar)), re.escape(repr(scalar))])
for tdi in [tdi1, tdi2, tdi3, tdi4, tdi5]:
with pytest.raises(TypeError, match=msg):
scalar in tdi._engine
with pytest.raises(KeyError, match=msg):
tdi._engine.get_loc(scalar)
class TestNumericEngine:
def test_is_monotonic(self, numeric_indexing_engine_type_and_dtype):
engine_type, dtype = numeric_indexing_engine_type_and_dtype
num = 1000
arr = np.array([1] * num + [2] * num + [3] * num, dtype=dtype)
# monotonic increasing
engine = engine_type(arr)
assert engine.is_monotonic_increasing is True
assert engine.is_monotonic_decreasing is False
# monotonic decreasing
engine = engine_type(arr[::-1])
assert engine.is_monotonic_increasing is False
assert engine.is_monotonic_decreasing is True
# neither monotonic increasing or decreasing
arr = np.array([1] * num + [2] * num + [1] * num, dtype=dtype)
engine = engine_type(arr[::-1])
assert engine.is_monotonic_increasing is False
assert engine.is_monotonic_decreasing is False
def test_is_unique(self, numeric_indexing_engine_type_and_dtype):
engine_type, dtype = numeric_indexing_engine_type_and_dtype
# unique
arr = np.array([1, 3, 2], dtype=dtype)
engine = engine_type(arr)
assert engine.is_unique is True
# not unique
arr = np.array([1, 2, 1], dtype=dtype)
engine = engine_type(arr)
assert engine.is_unique is False
def test_get_loc(self, numeric_indexing_engine_type_and_dtype):
engine_type, dtype = numeric_indexing_engine_type_and_dtype
# unique
arr = np.array([1, 2, 3], dtype=dtype)
engine = engine_type(arr)
assert engine.get_loc(2) == 1
# monotonic
num = 1000
arr = np.array([1] * num + [2] * num + [3] * num, dtype=dtype)
engine = engine_type(arr)
assert engine.get_loc(2) == slice(1000, 2000)
# not monotonic
arr = np.array([1, 2, 3] * num, dtype=dtype)
engine = engine_type(arr)
expected = np.array([False, True, False] * num, dtype=bool)
result = engine.get_loc(2)
assert (result == expected).all()
class TestObjectEngine:
engine_type = libindex.ObjectEngine
dtype = np.object_
values = list("abc")
def test_is_monotonic(self):
num = 1000
arr = np.array(["a"] * num + ["a"] * num + ["c"] * num, dtype=self.dtype)
# monotonic increasing
engine = self.engine_type(arr)
assert engine.is_monotonic_increasing is True
assert engine.is_monotonic_decreasing is False
# monotonic decreasing
engine = self.engine_type(arr[::-1])
assert engine.is_monotonic_increasing is False
assert engine.is_monotonic_decreasing is True
# neither monotonic increasing or decreasing
arr = np.array(["a"] * num + ["b"] * num + ["a"] * num, dtype=self.dtype)
engine = self.engine_type(arr[::-1])
assert engine.is_monotonic_increasing is False
assert engine.is_monotonic_decreasing is False
def test_is_unique(self):
# unique
arr = np.array(self.values, dtype=self.dtype)
engine = self.engine_type(arr)
assert engine.is_unique is True
# not unique
arr = np.array(["a", "b", "a"], dtype=self.dtype)
engine = self.engine_type(arr)
assert engine.is_unique is False
def test_get_loc(self):
# unique
arr = np.array(self.values, dtype=self.dtype)
engine = self.engine_type(arr)
assert engine.get_loc("b") == 1
# monotonic
num = 1000
arr = np.array(["a"] * num + ["b"] * num + ["c"] * num, dtype=self.dtype)
engine = self.engine_type(arr)
assert engine.get_loc("b") == slice(1000, 2000)
# not monotonic
arr = np.array(self.values * num, dtype=self.dtype)
engine = self.engine_type(arr)
expected = np.array([False, True, False] * num, dtype=bool)
result = engine.get_loc("b")
assert (result == expected).all()