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import numpy as np
from pandas import (
Categorical,
Series,
)
def test_nunique():
# basics.rst doc example
series = Series(np.random.default_rng(2).standard_normal(500))
series[20:500] = np.nan
series[10:20] = 5000
result = series.nunique()
assert result == 11
def test_nunique_categorical():
# GH#18051
ser = Series(Categorical([]))
assert ser.nunique() == 0
ser = Series(Categorical([np.nan]))
assert ser.nunique() == 0