df.mean(axis=1, numeric_only=True)
时间: 2023-10-10 18:14:31 浏览: 88
I'm sorry, as an AI language model, I cannot provide the exact output of this code without the context of the DataFrame being used. However, I can explain what this code does:
- df: This is the name of the DataFrame that the code is working on.
- mean(): This is a method of the DataFrame object that calculates the mean of the values along the specified axis.
- axis=1: This specifies that the mean should be calculated along the rows of the DataFrame.
- numeric_only=True: This specifies that only numeric columns should be included in the calculation of the mean.
Therefore, this code calculates the mean of the numeric values in each row of the DataFrame.
相关问题
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。
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")解释代码
这段代码主要进行数据处理,包括读取csv文件、删除指定列和删除全为NaN的列。然后使用Imputer类对NaN值进行填充,填充方法为使用该列的平均值。最后将处理后的数据保存为新的csv文件。
具体代码解释如下:
1. import pandas as pd import numpy as np from sklearn.preprocessing import Imputer from sklearn.model_selection import train_test_split
导入所需的库和模块。
2. df_table_all = pd.read_csv("D:\python_pytharm\datasets\chapter3_data_handled\\train_all.csv", index_col=0)
使用pandas库中的read_csv()函数读取指定路径下的csv文件,将其存储为DataFrame格式,并将第一列作为索引列。
3. df_table_all = df_table_all.drop(['LOAN_DATE_x'], axis=1) df_table_all = df_table_all.drop(['LOAN_DATE_y'], axis=1)
使用drop()函数删除指定列。
4. df_table_all = df_table_all.dropna(axis=1,how='all')
使用dropna()函数删除全为NaN的列。
5. columns = df_table_all.columns
获取DataFrame的列名。
6. imr = Imputer(missing_values='NaN', strategy='mean', axis=0)
创建Imputer对象,用于填充NaN值。missing_values参数指定需要填充的值,strategy参数指定填充方法,axis参数指定填充方向。
7. df_table_all = pd.DataFrame(imr.fit_transform(df_table_all.values))
使用fit_transform()函数填充NaN值,并将其转换为DataFrame格式。
8. df_table_all.columns = columns
将DataFrame的列名设置为原始列名。
9. df_table_all.to_csv("D:\python_pytharm\datasets\chapter3_data_handled\\trainafter.csv")
使用to_csv()函数将处理后的数据保存为新的csv文件。