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Update Day 1_Data_Preprocessing.md

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@ -15,6 +15,7 @@ import pandas as pd
``` ```
## 第2步：导入数据集 ## 第2步：导入数据集
```python ```python
//随后一列是label
dataset = pd.read_csv('Data.csv')//读取csv文件 dataset = pd.read_csv('Data.csv')//读取csv文件
X = dataset.iloc[ : , :-1].values//.iloc[行，列] X = dataset.iloc[ : , :-1].values//.iloc[行，列]
Y = dataset.iloc[ : , 3].values // : 全部行 or 列；[a]第a行 or 列 Y = dataset.iloc[ : , 3].values // : 全部行 or 列；[a]第a行 or 列