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import numpy as np from pandas import ( Series, date_range, ) class TestIsMonotonic: def test_is_monotonic_numeric(self): ser = Series(np.random.default_rng(2).integers(0, 10, size=1000)) assert not ser.is_monotonic_increasing ser = Series(np.arange(1000)) assert ser.is_monotonic_increasing is True assert ser.is_monotonic_increasing is True ser = Series(np.arange(1000, 0, -1)) assert ser.is_monotonic_decreasing is True def test_is_monotonic_dt64(self): ser = Series(date_range("20130101", periods=10)) assert ser.is_monotonic_increasing is True assert ser.is_monotonic_increasing is True ser = Series(list(reversed(ser))) assert ser.is_monotonic_increasing is False assert ser.is_monotonic_decreasing is True
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