human
Solve the following python programming problem given the following code:
def annotate_point(figure, axes, x, y, z, color) : 
    (xp1, yp1, _) = proj3d.proj_transform (x, axes, z, axes.get_proj ()) 
    label = axes.annotate ('{:.5g}'.format (z), xy = (xp1, yp1), xytext = ((- 20), 40), textcoords = 'offset points', ha = 'right', va = 'bottom', bbox = dict (boxstyle = 'round,pad=0.5', fc = color, alpha = 0.5), arrowprops = dict (arrowstyle = '->', connectionstyle = 'arc3,rad=0', color = color)) 
    def update_position(_) : 
        (xp2, yp2, _) = proj3d.proj_transform (x, y, z, axes.get_proj ()) 
        label.xy = (xp2, yp2) 
        label.update_positions (figure.canvas.renderer) 
        figure.canvas.draw () 
figure.canvas.mpl_connect ('button_release_event', update_position) 

    
    

    Fix the buggy line: (xp1, yp1, _) = proj3d.proj_transform (x, axes, z, axes.get_proj ())
assistant
#Here is Python code to fix the buggy line: (xp1, yp1, _) = proj3d.

(xp1, yp1, _) = proj3d.proj_transform (x, y, z, axes.get_proj ())