class_docstr: Test docstring. 
class_docstr_tok: ["Test","docstring","."]
code: def onkeyrelease(self, event):
      if event.key == "shift":
          self.shift_down = False
  
imports: from __future__ import division, print_function
  import matplotlib
  from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg
  from matplotlib.backends.backend_tkagg import NavigationToolbar2TkAgg
  from matplotlib.figure import Figure
  from matplotlib.contour import ContourSet
  import Tkinter
  import sys
  import numpy
  from sklearn import svm
  from sklearn.datasets import dump_svmlight_file
  from sklearn.externals.six.moves import xrange
label_desc: Use image node_id 4 for calling the View obj's underlying member method code with example usage: obj.onkeyrelease(event) without return types