(1) jupyter中编写python代码，使用pandas读取dating.txt中的数据，并对特征列数据进行归一化处理，归一化的范围为[3,4]。并将处理完的打印的结果截图放入下面框中。

import pandas as pd
import numpy as np

# 读取数据
data = pd.read_csv("dating.txt", header=None, sep='\t')
# 获取特征列
features = data.iloc[:, :3]
# 归一化处理
min_val = 3
max_val = 4
norm_features = (features - features.min()) / (features.max() - features.min())
norm_features = norm_features * (max_val - min_val) + min_val
# 打印结果
print(norm_features)

输出结果：