Safe Assignment in Python
From the Pandas cheat sheet · Assign and Index · verified Aug 2026
Safe Assignment
Assign in one step with loc.
python
df.loc[df["score"] < 80, "status"] = "review"📌 Chained assignment cannot update data in pandas 3
🎯 Use loc for conditional assignment
💡 assign supports readable method chains
🔍 Derived objects behave as copies under CoW
assignmentloccopy-on-write
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