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df.transform()
AI & DATA SCIENCE // df-transform
Call func on self producing a DataFrame with the same axis shape as self.
Syntax
res = df.groupby('A').transform(lambda x: x - x.mean())Examples
Example 01Basic Usage
res = df.groupby('A').transform(lambda x: x - x.mean())Best Practices
- Use vectorized operations over iterations (e.g.
iterrows()) for performance. - Always verify memory usage when loading large files.