将dataframe中的特定列转换为numpy数组并与原始数据帧合并

import pandas as pd
import numpy as np

df = pd.DataFrame({'A': [1, 2, 3], 'B': [4, 5, 6], 'C': [7, 8, 9]})

column_to_array = np.array(df['B'])

df['B_array'] = column_to_array

import pandas as pd
import numpy as np

df = pd.DataFrame({'A': [1, 2, 3], 'B': [4, 5, 6], 'C': [7, 8, 9]})

column_to_array = np.array(df['B'])

df['B_array'] = column_to_array