合并两个数组字符串对象-python

我试图“连接”或“合并”两个列列表,但在下面发现了一个错误。似乎它不喜欢复制品。任何帮助都将不胜感激。谢谢!

import numpy as np
import pandas as pd
df1 = pd.DataFrame(np.random.randint(0,10,size=(10, 4)), columns=list('ABCD'))
df2 = pd.DataFrame(np.random.randint(0,10,size=(10, 4)), columns=list('BCDE'))
df3 = pd.DataFrame(np.random.randint(0,10,size=(10, 4)), columns=list('CDEF'))
inclusive_list13 = np.intersect1d(df1.columns, df3.columns)
inclusive_list23 = np.intersect1d(df2.columns, df3.columns)

inclusive_list13
Out[3]: array(['C', 'D'], dtype=object)

inclusive_list23
Out[4]: array(['C', 'D', 'E'], dtype=object)

inclusive_list = inclusive_list13 + inclusive_list23

inclusive_list
ValueError: operands could not be broadcast together with shapes (2,) (3,)