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lines changed Original file line number Diff line number Diff line change @@ -3353,39 +3353,23 @@ def assign(self, **kwargs):
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Examples
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--------
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- >>> df = pd.DataFrame({'A': range(1, 11 ),
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- ... 'B': np.arange(-1.0, 2.0, 0.3 )})
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+ >>> df = pd.DataFrame({'A': range(1, 3 ),
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+ ... 'B': np.arange(-1.0, 2.0, 1.5 )})
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Where the value is a callable, evaluated on `df`:
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>>> df.assign(ln_A = lambda x: np.log(x.A))
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A B ln_A
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- 0 1 -1.0 0.000000
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- 1 2 -0.7 0.693147
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- 2 3 -0.4 1.098612
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- 3 4 -0.1 1.386294
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- 4 5 0.2 1.609438
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- 5 6 0.5 1.791759
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- 6 7 0.8 1.945910
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- 7 8 1.1 2.079442
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- 8 9 1.4 2.197225
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- 9 10 1.7 2.302585
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+ 0 1 -1.0 0.000000
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+ 1 2 0.5 0.693147
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Where the value already exists and is inserted:
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>>> newcol = np.log(df['A'])
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>>> df.assign(ln_A=newcol)
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A B ln_A
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- 0 1 -1.0 0.000000
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- 1 2 -0.7 0.693147
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- 2 3 -0.4 1.098612
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- 3 4 -0.1 1.386294
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- 4 5 0.2 1.609438
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- 5 6 0.5 1.791759
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- 6 7 0.8 1.945910
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- 7 8 1.1 2.079442
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- 8 9 1.4 2.197225
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- 9 10 1.7 2.302585
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+ 0 1 -1.0 0.000000
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+ 1 2 0.5 0.693147
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Where the keyword arguments depend on each other
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