Categorical Data in Python
From the Pandas cheat sheet · Text and Categories · verified Aug 2026
Categorical Data
Represent repeated finite labels efficiently.
python
df["size"] = df["size"].astype("category")💡 Categories reduce memory for repeated labels
📌 Ordered categories support meaningful sorting
⚠️ Add a category before assigning a new label
🔍 cat accessor manages category metadata
categorydtypememory
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