apply() — custom per-row logic — Data Science Applied

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Task

📝 **Question:** You need to double every value in a column. What's the fastest approach?

📋 Pick the right answer.

💡 **Hint:** Re-read the theory above if unsure.

Keep going

📊quiz

Time series: dates and resampling

📊quiz

Loading a CSV

📊quiz

Selecting columns and rows

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Prerequisites — what you should know before this track

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Prerequisites — what you should know before this track

🎯 Quiz

Question

📝 **Question:** You need to double every value in a column. What's the fastest approach?

📋 Pick the right answer.

💡 **Hint:** Re-read the theory above if unsure.

Keep going

💬 Discussion