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Changing the data type to category

# Specify the logical order of the weather ratings
cats = pd.CategoricalDtype(['good', 'bad', 'worse'], ordered=True)

# Change the data type of 'rating' to category
df['column'] = df.column.astype(cats)

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convert to category data type

df = df['col_name'].astype('category')

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Changing the data type to category

convert to category data type

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