FAQ: Modifying DataFrames - Review


This community-built FAQ covers the “Review” exercise from the lesson “Modifying DataFrames”.

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This exercise can be found in the following Codecademy content:

Data Science

Data Analysis with Pandas

FAQs on the exercise Review

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why cant i populate the ‘shoe_source’ column with this function?
orders[‘shoe_source’]= orders.shoe_material.apply(lambda x: ‘animal’ if orders.shoe_material == ‘leather’ else ‘vegan’)

nothing happens!


you are using ‘lambda x’ but not using x in the lambda function. the lambda is being applied to each value in orders.shoe_material already (orders.shoe_material.apply) so you need to reference x in the lambda instead of the whole orders.shoe_material series.

lambda x: ‘animal’ if x == ‘leather’ else ‘vegan’