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Introduction to pandas

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Optional Challenge #1 - Top Referrers

Optional Challenge 1 - Top Referrers We at CashBox believe that referrers are a great asset to our product. We'd like to know the top referrers with verified email addresses so that we can send them some motivational emails. Currently, anyone with 5 or more referrals is considered a top referrer. In the cell labelled CHALLENGE, follow the instructions to return what is required. Use Ke...