Question: fix this code: merged_df2 = pd.merge( left = population_df, right = gdp_df, how = 'outer', left_on = ['Year', 'Country name'], right_on = ['Year','Entity'] ). the
fix this code: merged_df2 = pd.merge( left = population_df, right = gdp_df, how = 'outer', left_on = ['Year', 'Country name'], right_on = ['Year','Entity'] ). the python error says: KeyError: 'Entity
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