Answers for "how to print unique values of a column in pandas"

get list of unique values in pandas column

a = df['column name'].unique() #returns a list of unique values

how to count unique values in a column dataframe in python

dataframe.column.nunique()

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