Matplotlib自定义标记/符号

Question

我在jupyter笔记本中运行第41个脚本，该脚本显示：

TypeError                                
 Traceback (most recent call last)
<ipython-input-4-a8519e2b712a> in <module>
     24 
     25 for i, mi in enumerate(markers):
---> 26     plt.plot(x[i], y[i], "b", alpha=0.5, marker=getRandomMarker(), markersize=randint(16,26,1))
     27     plt.plot(x[i], y[i]+50, "m", alpha=0.5, marker=getMarker(i), markersize=randint(16,26,1))
     28     # Let's see if their "center" is located where we expect them to be...

<ipython-input-4-a8519e2b712a> in getRandomMarker()
     17 
     18 def getRandomMarker():
---> 19     return "$"+markers[randint(0,len(markers),1)]+"$"
     20 
     21 def getMarker(i):
TypeError: only integer scalar arrays can be converted to a scalar index

但是，此脚本在空闲状态下可以很好地工作，为什么Notebook有此类错误？