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pd.melt()
AI & DATA SCIENCE // pd-melt
Unpivot a DataFrame from wide to long format.
Syntax
melted = pd.melt(df, id_vars=['A'], value_vars=['B', 'C'])Examples
Example 01Basic Usage
melted = pd.melt(df, id_vars=['A'], value_vars=['B', 'C'])Best Practices
- Use vectorized operations over iterations (e.g.
iterrows()) for performance. - Always verify memory usage when loading large files.