77 lines
2.5 KiB
Python
77 lines
2.5 KiB
Python
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# -*- coding: utf-8 -*-
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from datetime import datetime, timedelta
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import pytest
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import numpy as np
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from pandas.compat import long
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from pandas.tseries import offsets
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from pandas import Timestamp, Timedelta
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class TestTimestampArithmetic(object):
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def test_overflow_offset(self):
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# xref https://github.com/statsmodels/statsmodels/issues/3374
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# ends up multiplying really large numbers which overflow
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stamp = Timestamp('2017-01-13 00:00:00', freq='D')
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offset = 20169940 * offsets.Day(1)
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with pytest.raises(OverflowError):
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stamp + offset
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with pytest.raises(OverflowError):
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offset + stamp
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with pytest.raises(OverflowError):
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stamp - offset
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def test_delta_preserve_nanos(self):
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val = Timestamp(long(1337299200000000123))
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result = val + timedelta(1)
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assert result.nanosecond == val.nanosecond
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def test_timestamp_sub_datetime(self):
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dt = datetime(2013, 10, 12)
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ts = Timestamp(datetime(2013, 10, 13))
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assert (ts - dt).days == 1
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assert (dt - ts).days == -1
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def test_addition_subtraction_types(self):
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# Assert on the types resulting from Timestamp +/- various date/time
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# objects
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dt = datetime(2014, 3, 4)
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td = timedelta(seconds=1)
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# build a timestamp with a frequency, since then it supports
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# addition/subtraction of integers
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ts = Timestamp(dt, freq='D')
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assert type(ts + 1) == Timestamp
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assert type(ts - 1) == Timestamp
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# Timestamp + datetime not supported, though subtraction is supported
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# and yields timedelta more tests in tseries/base/tests/test_base.py
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assert type(ts - dt) == Timedelta
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assert type(ts + td) == Timestamp
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assert type(ts - td) == Timestamp
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# Timestamp +/- datetime64 not supported, so not tested (could possibly
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# assert error raised?)
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td64 = np.timedelta64(1, 'D')
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assert type(ts + td64) == Timestamp
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assert type(ts - td64) == Timestamp
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def test_addition_subtraction_preserve_frequency(self):
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ts = Timestamp('2014-03-05', freq='D')
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td = timedelta(days=1)
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original_freq = ts.freq
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assert (ts + 1).freq == original_freq
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assert (ts - 1).freq == original_freq
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assert (ts + td).freq == original_freq
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assert (ts - td).freq == original_freq
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td64 = np.timedelta64(1, 'D')
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assert (ts + td64).freq == original_freq
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assert (ts - td64).freq == original_freq
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