Series.value_counts()
pandas.Series.value_counts
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Series.value_counts(normalize=False, sort=True, ascending=False, bins=None, dropna=True) -
Returns object containing counts of unique values.
The resulting object will be in descending order so that the first element is the most frequently-occurring element. Excludes NA values by default.
Parameters: normalize : boolean, default False
If True then the object returned will contain the relative frequencies of the unique values.
sort : boolean, default True
Sort by values
ascending : boolean, default False
Sort in ascending order