Maximum recusion depth

[JoshuaAppleby]

Maximum recursion depth reached when plotting in 001_obstable.ipynb, cell 7, cell 17, cell 21.

# Plot the lost particles and the obstacle
obstacle = collider.lhcb1['obstacle']
fig2 = plt.figure(2)
plt.plot(lost_particles.x, lost_particles.y, '.', markersize=1)
plt.plot(obstacle.x_vertices, obstacle.y_vertices, 'k')

Can be fixed with either:

plt.plot(list(obstacle.x_vertices), list(obstacle.y_vertices), 'k')

or

obs_x, obs_y = obstacle.x_vertices, obstacle.y_vertices
plt.plot(obs_x, obs_y, 'k')