ai-content-maker/.venv/Lib/site-packages/pandas/tests/tslibs/test_conversion.py

162 lines
4.5 KiB
Python

from datetime import datetime
import numpy as np
import pytest
from pytz import UTC
from pandas._libs.tslibs import (
OutOfBoundsTimedelta,
astype_overflowsafe,
conversion,
iNaT,
timezones,
tz_convert_from_utc,
tzconversion,
)
from pandas import (
Timestamp,
date_range,
)
import pandas._testing as tm
def _compare_utc_to_local(tz_didx):
def f(x):
return tzconversion.tz_convert_from_utc_single(x, tz_didx.tz)
result = tz_convert_from_utc(tz_didx.asi8, tz_didx.tz)
expected = np.vectorize(f)(tz_didx.asi8)
tm.assert_numpy_array_equal(result, expected)
def _compare_local_to_utc(tz_didx, naive_didx):
# Check that tz_localize behaves the same vectorized and pointwise.
err1 = err2 = None
try:
result = tzconversion.tz_localize_to_utc(naive_didx.asi8, tz_didx.tz)
err1 = None
except Exception as err:
err1 = err
try:
expected = naive_didx.map(lambda x: x.tz_localize(tz_didx.tz)).asi8
except Exception as err:
err2 = err
if err1 is not None:
assert type(err1) == type(err2)
else:
assert err2 is None
tm.assert_numpy_array_equal(result, expected)
def test_tz_localize_to_utc_copies():
# GH#46460
arr = np.arange(5, dtype="i8")
result = tz_convert_from_utc(arr, tz=UTC)
tm.assert_numpy_array_equal(result, arr)
assert not np.shares_memory(arr, result)
result = tz_convert_from_utc(arr, tz=None)
tm.assert_numpy_array_equal(result, arr)
assert not np.shares_memory(arr, result)
def test_tz_convert_single_matches_tz_convert_hourly(tz_aware_fixture):
tz = tz_aware_fixture
tz_didx = date_range("2014-03-01", "2015-01-10", freq="H", tz=tz)
naive_didx = date_range("2014-03-01", "2015-01-10", freq="H")
_compare_utc_to_local(tz_didx)
_compare_local_to_utc(tz_didx, naive_didx)
@pytest.mark.parametrize("freq", ["D", "A"])
def test_tz_convert_single_matches_tz_convert(tz_aware_fixture, freq):
tz = tz_aware_fixture
tz_didx = date_range("2000-01-01", "2020-01-01", freq=freq, tz=tz)
naive_didx = date_range("2000-01-01", "2020-01-01", freq=freq)
_compare_utc_to_local(tz_didx)
_compare_local_to_utc(tz_didx, naive_didx)
@pytest.mark.parametrize(
"arr",
[
pytest.param(np.array([], dtype=np.int64), id="empty"),
pytest.param(np.array([iNaT], dtype=np.int64), id="all_nat"),
],
)
def test_tz_convert_corner(arr):
result = tz_convert_from_utc(arr, timezones.maybe_get_tz("Asia/Tokyo"))
tm.assert_numpy_array_equal(result, arr)
def test_tz_convert_readonly():
# GH#35530
arr = np.array([0], dtype=np.int64)
arr.setflags(write=False)
result = tz_convert_from_utc(arr, UTC)
tm.assert_numpy_array_equal(result, arr)
@pytest.mark.parametrize("copy", [True, False])
@pytest.mark.parametrize("dtype", ["M8[ns]", "M8[s]"])
def test_length_zero_copy(dtype, copy):
arr = np.array([], dtype=dtype)
result = astype_overflowsafe(arr, copy=copy, dtype=np.dtype("M8[ns]"))
if copy:
assert not np.shares_memory(result, arr)
else:
if arr.dtype == result.dtype:
assert result is arr
else:
assert not np.shares_memory(result, arr)
def test_ensure_datetime64ns_bigendian():
# GH#29684
arr = np.array([np.datetime64(1, "ms")], dtype=">M8[ms]")
result = astype_overflowsafe(arr, dtype=np.dtype("M8[ns]"))
expected = np.array([np.datetime64(1, "ms")], dtype="M8[ns]")
tm.assert_numpy_array_equal(result, expected)
def test_ensure_timedelta64ns_overflows():
arr = np.arange(10).astype("m8[Y]") * 100
msg = r"Cannot convert 300 years to timedelta64\[ns\] without overflow"
with pytest.raises(OutOfBoundsTimedelta, match=msg):
astype_overflowsafe(arr, dtype=np.dtype("m8[ns]"))
class SubDatetime(datetime):
pass
@pytest.mark.parametrize(
"dt, expected",
[
pytest.param(
Timestamp("2000-01-01"), Timestamp("2000-01-01", tz=UTC), id="timestamp"
),
pytest.param(
datetime(2000, 1, 1), datetime(2000, 1, 1, tzinfo=UTC), id="datetime"
),
pytest.param(
SubDatetime(2000, 1, 1),
SubDatetime(2000, 1, 1, tzinfo=UTC),
id="subclassed_datetime",
),
],
)
def test_localize_pydatetime_dt_types(dt, expected):
# GH 25851
# ensure that subclassed datetime works with
# localize_pydatetime
result = conversion.localize_pydatetime(dt, UTC)
assert result == expected