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Practical Predictive Analytics by Ralph Winters

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Examining the metadata

After reading in any file, it is always a good practice to verify the number of rows, and look at the metadata after a dataframe is created. We can do that easily with the str() function. The str() function is an incredibly useful function that is packed with a lot of the type of metadata information that we discussed in Chapter 2, The Modeling Process. It is always a good idea to run the str() function every time you read, merge, join, or create a new file:

str(member)str(purchases)str(purchases_filtered) 

If you switch over to the console, you can see that both member and purchases have 1,000 rows, and the purchases_filtered ...

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