显示特定列上两个数据帧的差异

import pandas as pd

df1 = pd.DataFrame({'A': [1, 2, 3, 4],
                    'B': [5, 6, 7, 8],
                    'C': [9, 10, 11, 12]})
                    
df2 = pd.DataFrame({'A': [1, 2, 6, 4],
                    'B': [5, 9, 7, 8],
                    'C': [9, 10, 15, 12]})

merged_df = pd.merge(df1, df2, on='A', suffixes=('_df1', '_df2'))

merged_df['Difference'] = merged_df['B_df1'] - merged_df['B_df2']

print(merged_df)