如何在python中的3d图中设置轴的线宽？ mpl.rcParams是否有可能？ 代码：

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

mpl.rcParams['legend.fontsize'] = 10

fig = plt.figure()
ax = fig.gca(projection='3d')
theta = np.linspace(-4 * np.pi,4 * np.pi,100)
z = np.linspace(-2,2,100)
r = z**2 + 1
x = r * np.sin(theta)
y = r * np.cos(theta)
ax.plot(x,y,z,label='parametric curve')
ax.legend()

plt.show()