Counting unique labels

As Peter mentioned in the video, there are over 100 unique labels. In this exercise, you will explore this fact by counting and plotting the number of unique values for each category of label.

The dataframe df and the LABELS list have been loaded into the workspace; the LABELS columns of df have been converted to category types.

pandas, which has been pre-imported as pd, provides a pd.Series.nunique method for counting the number of unique values in a Series.

Create the DataFrame num_unique_labels by using the .apply() method on df[LABELS] with pd.Series.nunique as the argument.
Create a bar plot of num_unique_labels using pandas' .plot(kind='bar') method.
The axes have been labeled for you, so hit 'Submit Answer' to see the number of unique values for each label.

Take Hint (-30 XP)

Exercise

Counting unique labels

Instructions