upstream/ipython Files · docs/examples/lib/gui-mpl.py

Move crash handling to the application level and simplify class structure....

Move crash handling to the application level and simplify class structure. Starting to try to take real advantage of the refactoring, to have generic crash handling. This also lets us initialize the app without needing all the self.attempt() wrappers, since now there's a good system-wide crash handler at the app level (not inside the shell instance). I didn't yet remove the attempt() method because we may have occasional uses for it (we still do, but in one place only). I also removed some extra class layers that weren't quite needed. Creating classes solely for the purpose of passing parameters makes the code (IMO) harder to understand, I kept getting lost in parts of the class hierarchy. I think these changes provide the same flexibility but with easier to follow code (less things to remember, basically). What I tried to do was to use argument passing instead of inheritance for all cases I saw where the inheritance wasn't really adding new functionality. In some cases, this actually allowed me to remove methods that were effectively duplicated in the subclasses.

Brian Granger - - Load All Authors

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      """Test the new %gui command.  Run this in ipython as

      In [1]: %gui [backend]

      In [2]: %run switchgui [backend]

      where the optional backend can be one of:  qt4, gtk, tk, wx.

      Because of subtle difference in how Matplotlib handles the different GUI 

      toolkits (in things like draw and show), minor modifications to this script

      have to be made for Tk to get it to work with the 0.99 and below releases

      of Matplotlib.  However, in the future, Matplotlib should be able to have 

      similar logic for all the toolkits, as they are all now using PyOS_InputHook.

      """

      import sys

      import time

      from  IPython.lib import inputhook

      gui = inputhook.current_gui()

      if gui is None:

          gui = 'qt4'

          inputhook.enable_qt4(app=True)

      backends = dict(wx='wxagg', qt4='qt4agg', gtk='gtkagg', tk='tkagg')

      import matplotlib

      matplotlib.use(backends[gui])

      matplotlib.interactive(True)

      import matplotlib

      from matplotlib import pyplot as plt, mlab, pylab

      import numpy as np

      from numpy import *

      from matplotlib.pyplot import *

      x = np.linspace(0,pi,500)

      print "A plot has been created"

      line, = plot(x,sin(2*x))

      inputhook.spin() # This has to be removed for Tk

      print "Now, we will update the plot..."

      print

      for i in range(1,51):

          print i, 

          sys.stdout.flush()

          line.set_data(x,sin(x*i))

          plt.title('i=%d' % i)

          plt.draw()

          inputhook.spin() # This has to be removed for Tk

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				"""Test the new %gui command. Run this in ipython as

				In [1]: %gui [backend]

				In [2]: %run switchgui [backend]

				where the optional backend can be one of: qt4, gtk, tk, wx.

				Because of subtle difference in how Matplotlib handles the different GUI
				toolkits (in things like draw and show), minor modifications to this script
				have to be made for Tk to get it to work with the 0.99 and below releases
				of Matplotlib. However, in the future, Matplotlib should be able to have
				similar logic for all the toolkits, as they are all now using PyOS_InputHook.
				"""

				import sys
				import time

				from IPython.lib import inputhook

				gui = inputhook.current_gui()
				if gui is None:
				gui = 'qt4'
				inputhook.enable_qt4(app=True)

				backends = dict(wx='wxagg', qt4='qt4agg', gtk='gtkagg', tk='tkagg')

				import matplotlib
				matplotlib.use(backends[gui])
				matplotlib.interactive(True)

				import matplotlib
				from matplotlib import pyplot as plt, mlab, pylab
				import numpy as np

				from numpy import *
				from matplotlib.pyplot import *

				x = np.linspace(0,pi,500)

				print "A plot has been created"
				line, = plot(x,sin(2*x))
				inputhook.spin() # This has to be removed for Tk


				print "Now, we will update the plot..."
				print
				for i in range(1,51):
				print i,
				sys.stdout.flush()
				line.set_data(x,sin(x*i))
				plt.title('i=%d' % i)
				plt.draw()
				inputhook.spin() # This has to be removed for Tk