how to find number of categories in python 1

how to find number of categories in python

from collections import Counter
df = pd.DataFrame({'a':['apple','apple','banana','peach', 'banana', 'apple']})

print Counter(df['a'])
>> Counter({'apple': 3, 'banana': 2, 'peach': 1})

Here is what the above code is Doing:
1. Create a dataframe with a column ‘a’
2. Create a Counter object from the column ‘a’
3. Print the Counter object

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