如何在matplotlib事件中捕获异常

如何解决如何在matplotlib事件中捕获异常

我在matplotlib keypress事件代码中引发了异常。异常被matplotlib静默捕获并打印。我想捕获异常（以便在任意行中引发该异常时进行调试）。如何告诉matplotlib引发异常？

Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib/python2.7/lib-tk/Tkinter.py",line 1540,in __call__
    return self.func(*args)
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/backends/_backend_tk.py",line 428,in key_press
    figureCanvasBase.key_press_event(self,key,guiEvent=event)
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/backend_bases.py",line 1874,in key_press_event
    self.callbacks.process(s,event)
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/cbook/__init__.py",line 392,in process
    proxy(*args,**kwargs)
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/cbook/__init__.py",line 232,in __call__
    return mtd(*args,**kwargs)
  File "mycode.py",line 345,in keypress

我尝试删除exception_handler，但是matplotlib仍然捕获了异常。

import matplotlib.cbook
fig.canvas.callbacks = matplotlib.cbook.CallbackRegistry(exception_handler=None)
fig.canvas.mpl_connect('key_press_event',keypress)