pandas list of distinct values in a column code example

Example 1: how to get distinct value in a column dataframe in python

df.column.unique()

Example 2: pandas count the number of unique values in a column

df['hID'].nunique()
5

Example 3: pandas count distinct values in a column

Series.value_counts(self, normalize=False, sort=True, ascending=False, bins=None, dropna=True)

Example 4: python extract values that have different values in a column

df = pd.DataFrame({'author':['a', 'a', 'b'], 'products':['sr1', 'sr2', 'sr2']}) # Create df

group = df.groupby('author') # Group by author used as index
df2 = group.apply(lambda x: x['subreddit'].unique()) # List of all product per author
df2 = df2.apply(pd.Series) # Split products in multiple columns