数据：
转换代码：嘿嘿嘿，导包和print不算，刚好两行

import numpy as np
import pandas as pd

df = pd.read_excel(r'river_data.xlsx')
print(type(df))
print(df.values)
np.array(df)
print(type(np.array(df)))

转换结果：
转换前：<class ‘pandas.core.frame.DataFrame’>，转换后：<class ‘numpy.ndarray’>