在正确的前提下，用其他形式表达这段代码：import pandas as pd import numpy as np from sklearn.preprocessing import Imputer from sklearn.model_selection import train_test_split df_table_all = pd.read_csv("D:\python_pytharm\datasets\chapter3_data_handled\train_all.csv", index_col=0) df_table_all = df_table_all.drop(['LOAN_DATE_x'], axis=1) df_table_all = df_table_all.drop(['LOAN_DATE_y'], axis=1) df_table_all = df_table_all.dropna(axis=1,how='all') columns = df_table_all.columns imr = Imputer(missing_values='NaN', strategy='mean', axis=0) df_table_all = pd.DataFrame(imr.fit_transform(df_table_all.values)) df_table_all.columns = columns df_table_all.to_csv("D:\python_pytharm\datasets\chapter3_data_handled\trainafter.csv")

使用Python代码块的格式：

import pandas as pd 
import numpy as np 
from sklearn.preprocessing import Imputer 
from sklearn.model_selection import train_test_split 

df_table_all = pd.read_csv("D:\python_pytharm\datasets\chapter3_data_handled\train_all.csv", index_col=0) 
df_table_all = df_table_all.drop(['LOAN_DATE_x'], axis=1) 
df_table_all = df_table_all.drop(['LOAN_DATE_y'], axis=1) 
df_table_all = df_table_all.dropna(axis=1,how='all') 

columns = df_table_all.columns 
imr = Imputer(missing_values='NaN', strategy='mean', axis=0) 
df_table_all = pd.DataFrame(imr.fit_transform(df_table_all.values)) 
df_table_all.columns = columns 
df_table_all.to_csv("D:\python_pytharm\datasets\chapter3_data_handled\trainafter.csv")

这段代码导入了必要的库，读取了一个csv文件并对其进行了预处理，最后将处理后的结果保存到了另一个csv文件中。