合并2个具有不同列名的dataFrames，显示公共元素，以及数据帧之间的差异

import pandas as pd

df1 = pd.DataFrame({'A': [1, 2, 3], 'B': [4, 5, 6]})
df2 = pd.DataFrame({'C': [1, 2, 4], 'D': [7, 8, 9]})

common_elements = pd.merge(df1, df2, how='inner', left_on='A', right_on='C')
print(common_elements)

df1_diff = df1[~df1.isin(common_elements)].dropna()
df2_diff = df2[~df2.isin(common_elements)].dropna()
print("df1与df2的差异：")
print(df1_diff)
print(df2_diff)