Index and MultiIndex in Python
From the Pandas cheat sheet · Assign and Index · verified Aug 2026
Index and MultiIndex
Set meaningful row labels and hierarchical indexes.
python
df = df.set_index("id")
df = df.reset_index()📌 Index values should identify rows predictably
💡 Sort a MultiIndex before label slicing
🔍 reset_index moves labels back to columns
🎯 Keep normal columns unless hierarchy adds value
indexmultiindexlabels
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