python get unique values in column code example

Example 1: pandas unique values in column

#List unique values in the df['name'] column
df.name.unique()

Example 2: pandas unique values to list

df.groupby('param')['column'].nunique().sort_values(ascending=False).unique().tolist()

Example 3: 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