import rhinoscriptsyntax as rs
msg1="Pick first point of line in Top view"
msg2="Pick second point of line in Top view"
line_pts=rs.GetLine(1,message1=msg1,message2=msg2)
the second message prompt is ignored.
Message 1 is seen, but after the first point is picked, instead of message 2, one sees End of line at the command prompt.