pandas unique values multiple columns different dtypes

Question

Similar to pandas unique values multiple columns I want to count the number of unique values per column. However, as the dtypes differ I get the following error:

The data frame looks like A small[['TARGET', 'title']].apply(pd.Series.describe) gives me the result, but only for the category types and I am unsure how to filter the index for only the last row with the unique values per column

Answer 1

Use apply and np.unique to grab the unique values in each column and take its size :

small[['TARGET','title']].apply(lambda x: np.unique(x).size)

Thanks!