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POPython: variable is not correctly initialized?
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3996142
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3996203
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2010-10-22T11:00:04.110
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2010-10-22T15:26:01.333
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2010-10-22T11:16:49.570
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I wrote the following code in python <pre><code>self._job = None #slider def sliderCallback(self): if self._job: </code></pre> And I get this error message <pre><code>AttributeError: 'str' object has no attribute '_job' </code></pre> why ? I thought I have initialized the variable before... Update Same issue with Timer variable <pre><code>import Tkinter as tk import vtk from time import * from threading import * from vtk.tk import * from Visualization import * from Histogram import * from ListItem import * class UI(tk.Frame): def build(self, root): #left column self.leftFrame = tk.Frame(root, width=400, height=550, bg="black") #.grid(column=4, row=0) self.leftFrame.pack(fill=tk.BOTH, expand=True, side=tk.LEFT) #right column self.rightFrame = tk.Frame(root, width=400, height=550, bg="black") #.grid(column=4, row=0) self.rightFrame.pack(fill=tk.BOTH, expand=True, side=tk.RIGHT) #self.rightBottomFrame = tk.Frame(rightFrame, width=400, height=550, bg="red") #.grid(column=4, row=0) #visualization self.vis = Visualization(self.rightFrame, 400, 350, tk.RIGHT) #self.vis.updateContourValue(400) #left column self.middleFrame = tk.Frame(root, width=400, height=550, bg="black") #.grid(column=0, columnspan=4, row=0) self.middleFrame.pack(fill=tk.Y, expand=True) #isosurfaces list def addItem(color, volume, surface): listitem = ListItem(self.listFrame, color, volume, surface) self.listFrame = tk.Frame(self.middleFrame, width=400, height=500, bg="black") #.grid(column=0, columnspan=4, row=0) self.listFrame.pack(fill=tk.BOTH, expand=True, side=tk.TOP) addItem("#243", self.vis.getVolume(), self.vis.getSurface()) #preview self.preview = Visualization(self.middleFrame, 200, 200, tk.BOTTOM) #self.preview.updateContourValue(1500) #histogram self.histFrame = Histogram(self.leftFrame, 400, 400, tk.TOP, self.preview.getData()) #slider def updateValue(self): self.preview.updateContourValue(float(self.slider.get() )) print "updated value" self.timer = Timer(5.0, updateValue) def sliderCallback(self): self.timer.cancel() self.timer.start() # after 30 seconds, "hello, world" will be printed #if self._job: #root.after_cancel(self._job) #print "remove it" #self._job = root.after(500, self.updateValue) #def updateValue(value): #print('horizontal: {v}'.format(v=value)) self.slider = tk.Scale(self.leftFrame, from_=0, to=256, orient=tk.HORIZONTAL, command=sliderCallback) #.grid(column=0, columnspan=3, row=1) self.slider.pack(in_=self.leftFrame, fill=tk.X) self.slider.set(200) #add Isosurface button def addIso(): addItem("#243", self.vis.getVolume(), self.vis.getSurface()) self.addButton = tk.Button(self.leftFrame, text="Add", command=addIso) #.grid(column=3, row=1) self.addButton.pack(in_=self.leftFrame, side="right", pady=2) </code></pre>
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Python: variable is not correctly initialized?
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