You can merge two dataframes df1 and df2 based on columns df1['A'] and df2['B'] using the following code:

merged_df = pd.merge(df1, df2, left_on='A', right_on='B')

This will merge the two dataframes on the columns A and B, respectively, and create a new dataframe merged_df. The resulting dataframe will contain only the rows where the values in columns A and B match.

Note that this assumes you have imported the Pandas library as pd.
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