在我的代碼matplotlib庫中得到了這個：ax.spines['top'].set_visible(False)ax.spines['right'].set_visible(False)ax.spines['bottom'].set_position('zero')ax.spines['left'].set_position('zero')它告訴我：我期待斧頭被砍！如何獲得切割軸？這是完整的代碼：import matplotlib.pyplot as pltpgcd = lambda a, b: a if b==0 else pgcd(b, a%b)def EKG(n):    ekg = [1, 2]    i = 2    while i < n:        j = 1        while j in ekg or pgcd(j, ekg[i-1]) == 1:            j += 1        ekg.append(j)        i += 1    return ekgsupEKG = lambda n: sum(a>n for a in EKG(n))arr = []r = range(3, 100)for n in r:    arr.append(supEKG(n))f = plt.figure()ax = f.add_subplot(1,1,1)ax.plot(r, arr)ax.spines['top'].set_visible(False)ax.spines['right'].set_visible(False)ax.spines['bottom'].set_position('zero')ax.spines['left'].set_position('zero')plt.show()