pandas dataframe assign doesn't update the dataframe

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I made a pandas dataframe of the Iris dataset and I want to put 4 extra column in it. The content of the columns have to be SepalRatio, PetalRatio, SepalMultiplied, PetalMul

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我在风中等你

2020-12-19 16:00

You need assign output to variable like:

iris = iris.assign(SepalRatio = iris['SepalLengthCm'] / iris['SepalWidthCm']).assign(PetalRatio = iris['PetalLengthCm'] / iris['PetalWidthCm']).assign(SepalMultiplied = iris['SepalLengthCm'] * iris['SepalWidthCm']).assign(PetalMultiplied = iris['PetalLengthCm'] * iris['PetalWidthCm'])

Beter is use only one assign:

iris = iris.assign(SepalRatio = iris['SepalLengthCm'] / iris['SepalWidthCm'],
                   PetalRatio = iris['PetalLengthCm'] / iris['PetalWidthCm'],
                   SepalMultiplied = iris['SepalLengthCm'] * iris['SepalWidthCm'],
                   PetalMultiplied = iris['PetalLengthCm'] * iris['PetalWidthCm'])

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