LP summation issue with pulp

Question

I have imported an Excel file to python using pandas.read_excel and changed it to a Dataframe using pandas.DataFrame. Table Ingredients

I have defined variables using: x = pulp.LpVariable.dicts("Ingr", ((i) for i in data_df['Ingredients']), lowBound=0)

I want to write a summation which is basically costs[i] * x[i]. I have difficulty indexing costs over ingredients

prob += lpSum(x[i]*data_df['costs'][i] for i in data_df)

Any help is appreciated.