import matplotlib.pyplot as plt

import numpy as np

y = df.loc[0:100,2].values

y = np.where(y==1, 2,-2)

X=df.iloc[0:17, [0,2]].values

plt.scatter(X[:9,0],X[:9,1],color='red',marker='o',label='setosa')

plt.scatter(X[9:17, 0], X[9:17,1], color='blue', marker='+', label='rating')

plt.xlabel("Length of Petal")

plt.ylabel("Length of Scape")

plt.legend(loc='upper left')

plt.show()

報的錯誤是:?ValueError: First argument must be a sequence

請問各位大神，這個問題怎么解決啊，昨天花了大半天也沒搞清楚這個錯誤是什么。謝謝了先?。。?/p>