Python 3.x 数据帧的三维绘图

**我试图在3D中绘制一个数据帧。我做错了什么**

x = drop_1row_df.columns.tolist()
print(x)

y = drop_1row_df.index.strftime("%d %b, %Y").tolist()
print(y)

import matplotlib as mpl
import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d import Axes3D
import numpy as np

X,Y = np.meshgrid(x,y)
Z = drop_1row_df
fig = plt.figure()
ax = fig.add_subplot(111, projection='3d')
ax.plot_surface(X, Y, Z)