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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
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