Use the month_name() function instead of month to show the month names instead of the month numbers in python

Sample data

purchase_date	product_type
01/01/2020	Canvas Painting
02/01/2020	Framed Poster
03/01/2020	Framed Poster
04/01/2020	Framed Poster
05/01/2020	Canvas Painting
06/01/2020	Poster Print
07/01/2020	Framed Poster
08/01/2020	Framed Poster
09/01/2020	Canvas Painting
10/01/2020	Framed Poster

My code isn't working

import pandas as pd

import numpy as np

from datetime import datetime

df = pd.read_csv('sales.csv')

df['month'] = pd.DatetimeIndex(df['purchase_date']).month_name()

df['month'].value_counts()

print(df.month_name.value_counts())