matplotlib plot 绘图函数发生阻塞（block）时的解决方法

Is there a way to detach matplotlib plots so that the computation can continue?

• 在一般编辑器中：

  from matplotlib.pyplot import plot, draw, show
  plot([1,2,3])
  draw()
  print 'continue computation'
  
  # at the end call show to ensure window won't close.
  
  show()

• 在交互（interactive）模式下（比如 IPython）：

  from matplotlib.pyplot import plot, ion, show
  ion() # enables interactive mode
  plot([1,2,3]) # result shows immediatelly (implicit draw())
  
  print 'continue computation'
  
  # at the end call show to ensure window won't close.
  
  show()