如何将Google Colab中的长代码拆分为多行？

首先，你的变量名4y不符合Python语法规则——变量名不能以数字开头，运行时会触发语法错误，建议改为y4或其他合法名称（比如selected_data）。

针对长列表的拆分需求，Python支持在方括号内直接换行，只要保持元素用逗号分隔即可，这种方式可读性最强，示例如下：

# 修正变量名并拆分代码
y4 = bio_fix_drop[
    [
        'Radius_mean', 
        'Radius_mean', 
        'Texture_mean', 
        'perimeter_mean', 
        'area_mean', 
        'smoothness_mean', 
        'compactness_mean', 
        'concavity_mean', 
        'concave points_mean', 
        'symmetry_mean', 
        'fractal_dimension_mean', 
        'radius_se', 
        'texture_se', 
        'perimeter_se', 
        'area_se', 
        'smoothness_se', 
        'compactness_se', 
        'concavity_se', 
        'concave points_se', 
        'symmetry_se', 
        'fractal_dimension_se', 
        'radius_worst', 
        'texture_worst', 
        'perimeter_worst', 
        'area_worst', 
        'smoothness_worst', 
        'compactness_worst', 
        'concavity_worst', 
        'concave points_worst', 
        'symmetry_worst', 
        'fractal_dimension_worst', 
        'diagnosis'
    ]
]

修改完成后，直接执行print(y4)即可正常输出变量内容。

另外也可以使用反斜杠\换行，但这种方式可读性较差，不推荐：

y4 = bio_fix_drop[\
    ['Radius_mean', 'Radius_mean', 'Texture_mean', \
     'perimeter_mean', 'area_mean', 'smoothness_mean', \
     'compactness_mean', 'concavity_mean', 'concave points_mean', \
     'symmetry_mean', 'fractal_dimension_mean', 'radius_se', \
     'texture_se', 'perimeter_se', 'area_se', 'smoothness_se', \
     'compactness_se', 'concavity_se', 'concave points_se', \
     'symmetry_se', 'fractal_dimension_se', 'radius_worst', \
     'texture_worst', 'perimeter_worst', 'area_worst', \
     'smoothness_worst', 'compactness_worst', 'concavity_worst', \
     'concave points_worst', 'symmetry_worst', 'fractal_dimension_worst', \
     'diagnosis']\
]

内容的提问来源于stack exchange，提问作者Hasif