双坐标图遇瓶颈 该如何消除

https://img-mid.csdnimg.cn/release/static/image/mid/ask/524497341366161.png

fig = plt.figure(figsize=(2.3,1.5)) 
ax = HostAxes(fig, [0.1, 0.1, 0.7, 0.7])  #用[left, bottom, weight, height]的方式定义axes, 0 <= l,b,w,h <= 1

#plt.tick_params(bottom=True, top=True, left=True, right=True)

#ax02.tick_params(bottom=True, top=False, left=False, right=False)


kw = dict(linewidth = 0.5,markerfacecolor='none',markersize = 1)

#parasite addtional axes, share x
ax02 = ParasiteAxes(ax, sharex=ax)
#ax03 = ParasiteAxes(ax, sharex=ax)

#append axes
ax.parasites.append(ax02)
#ax.parasites.append(ax03)

#ax03_axisline = ax02.get_grid_helper().new_fixed_axis
#ax03.axis['right4'] = ax03_axisline(loc='right', axes=ax03, offset=(60,0))


fig.add_axes(ax)
#h1, = ax.plot(t1, x1, linewidth=2,marker='o',markevery=idx,markerfacecolor="orange",label="小型车横向位移")
h1, = ax.plot(t1, x1, linewidth=0.7,marker='.',markevery=idx,markerfacecolor="orange",label="Trajectory of car1481")
#h4,=ax.plot(t2, x2, linewidth=0.8,label="Trajectory of truck")
h2, = ax02.plot(t1,v1, linewidth=0.7,label="Speed of car1481")
#h5, = ax02.plot(t2,v2, linestyle='--',linewidth=2,label="Velocity of truck")
#h3 = ax03.plot(t1,a1,linestyle=':',linewidth=2,label='小型车加速度')
#h6 = ax03.plot(t2,a2,linestyle=':',linewidth=2,label='大型车加速度')
for i in idx:
    temp=float(df_1.loc[i,["Local_X"]])
    plt.axhline(y=temp, color='black', linestyle='-.',linewidth=0.8)

#invisible right axis of ax
ax.axis['right'].set_visible(False)
ax.axis['top'].set_visible(True)
ax02.axis['right'].set_visible(True)
ax02.axis['right'].major_ticklabels.set_visible(True)
ax02.axis['right'].label.set_visible(True)

#set label for axis
ax.set_ylabel('Lateral position(m)',labelpad=0.01)
ax.set_xlabel('Time(s)',labelpad=0.01)
ax02.set_ylabel('Speed(m/s)',labelpad=0.01)

my_x_ticks = np.arange(-10,11, 2)#原始数据有11个点，故此处为设置从-10开始，间隔为2
plt.xticks(my_x_ticks)





#set xlim for yaxis
# ax.set_ylim(4,15)
# ax02.set_ylim(8,22)
# ax03.set_ylim(-10,10)

ax.legend()

#name axies, xticks colors
ax.axis['left'].label.set_color('black')
ax02.axis['right'].label.set_color('black')
#ax03.axis['right4'].label.set_color('black')

ax.axis['left'].major_ticks.set_color('black')
ax02.axis['right'].major_ticks.set_color('black')
#ax03.axis['right4'].major_ticks.set_color('black')

ax.axis['left'].major_ticklabels.set_color('black')
ax02.axis['right'].major_ticklabels.set_color('black')
#ax03.axis['right4'].major_ticklabels.set_color('black')


ax.axis['left'].line.set_color('black')
ax02.axis['right'].line.set_color('black')
#ax03.axis['right4'].line.set_color('black')

plt.legend(loc="upper left",framealpha=0) 
ax.spines['top'].set_linewidth(500)
plt.savefig(('D:/Users/Bella/Desktop/car11481.png'), dpi=3000, bbox_inches = 'tight')#保存图片##################

怎么样才能让图片上方的小竖线都消失！