How do I map sets in Python using pandas?

Mapping sets using pandas can be very useful for transforming or associating values in a DataFrame with corresponding values in a set or list. The map() function is particularly useful in this context.

Here’s an example of how to use the map() function with pandas to map values from a set:


import pandas as pd

# Create a DataFrame
data = {'A': ['apple', 'banana', 'cherry', 'date']}
df = pd.DataFrame(data)

# Define a mapping set
mapping_set = {'apple': 'fruit', 'banana': 'fruit', 'carrot': 'vegetable'}

# Map the values in column 'A'
df['mapped'] = df['A'].map(mapping_set)

print(df)