import pandas data = pandas.read_csv("creditcard.csv") guessed_class = [] for r in data.iterrows(): good = True if abs(r[1]["V17"] - -6.665836399449663) < abs(r[1]["V17"] - 0.01153506325212925): good = False guessed_class.append(0 if good else 1) data["guess"] = guessed_class print(data.head(10)) data.to_csv("woo2.csv")