value counts 28 29 in pandas

1df = df.value_counts().rename_axis('unique_values').reset_index(name='counts')
2print (df)
3   unique_values  counts
40              2       3
51              1       2
6

1>>> index = pd.Index([3, 1, 2, 3, 4, np.nan])
2>>> index.value_counts()
33.0    2
44.0    1
52.0    1
61.0    1
7dtype: int64
8

1df.nunique()

1
2
3df.letters.value_counts().sort_values().plot(kind = 'barh')
4

1from collections import Counter
2values=np.ones(10)
3Counter(values)

1use of value_counts()