GroupBy Aggregation in Python
From the Pandas cheat sheet · Group and Aggregate · verified Aug 2026
GroupBy Aggregation
Calculate one or more summaries per group.
python
summary = df.groupby("team")["score"].mean()📌 GroupBy follows split, apply, combine
💡 Named aggregation creates clear columns
🔍 as_index=False keeps group keys as columns
⚡ Prefer built-in aggregations over lambdas
groupbyaggregationsummary
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