Programming Python第七章在讲解Scale的例子7-30里有这样一段代码：
 *Scale(self, label='Pick demo number',
command=self.onMove, 
variable=self.var,*
* from_=0, to=len(demos)-1).pack()*
其中为command对应的函数是：
 *def onMove(self, value):
print 'in onMove', value
*value应该是对应Scale当前的值，可它是从哪儿蹦出来的呢？
看了半天想不明白，各位高手帮忙解答一下？thx，^_^
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应该是由tkinter自动传给你的。一般事件处理方法都需要接收一个event参数，这个参数是由事件管理器管理，事件的处理方法也是由事件管理器来调用的，它会把事件参数传给处理方法。这是我的理解。

On Apr 8, 2005 2:53 PM, SS Ringster <cvx.zero at gmail.com> wrote:
> Programming Python第七章在讲解Scale的例子7-30里有这样一段代码： 
>            Scale(self, label='Pick demo number',
>                     command=self.onMove,           
>                     variable=self.var, 
>                     from_=0, to=len(demos)-1).pack() 
> 其中为command对应的函数是： 
>            def onMove(self, value):
>                  print 'in onMove', value
> value应该是对应Scale当前的值，可它是从哪儿蹦出来的呢？ 
> 看了半天想不明白，各位高手帮忙解答一下？thx，^_^
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python-chinese我的系统是windows XP SP2、sun J2se 1.4.2.07、Jython 2.1
---------------------------------------------------------------------------------
C:\jython21\Demo\applet>c:\jython21\jythonc --core --deep --jar appletdemo.jar *
.py
processing ButtonDemo
processing pawt.__init__
processing ButtonFontDemo
processing CheckboxDemo
processing ChoiceDemo
processing Converter
processing CoordinatesDemo
processing HelloApplet
processing HelloWorld
processing LabelDemo
processing ListDemo

Required packages:
  java.applet
  java.awt.event

Creating adapters:
  java.awt.event.WindowListener used in __init__
  java.awt.event.ItemListener used in ChoiceDemo, ListDemo
  java.awt.event.ActionListener used in ButtonDemo, ButtonFontDemo, ListDemo
  java.awt.event.MouseListener used in CoordinatesDemo

Creating .java files:
  HelloWorld module
    HelloWorld extends java.applet.Applet
  ButtonFontDemo module
    ButtonFontDemo extends java.applet.Applet
  HelloApplet module
    HelloApplet extends java.applet.Applet
  __init__ module
  ButtonDemo module
    ButtonDemo extends java.applet.Applet
  LabelDemo module
    LabelDemo extends java.applet.Applet
  CheckboxDemo module
    CheckboxDemo extends java.applet.Applet
  ChoiceDemo module
    ChoiceDemo extends java.applet.Applet
  ListDemo module
    ListDemo extends java.applet.Applet
  Converter module
    ConversionPanel extends java.awt.Panel implements java.awt.event.ActionListe
ner, java.awt.event.AdjustmentListener, java.awt.event.ItemListener
    Converter extends java.applet.Applet
  CoordinatesDemo module
    CoordinateArea extends java.awt.Canvas
    FramedArea extends java.awt.Panel
    CoordinatesDemo extends java.applet.Applet

Compiling .java to .class...
Compiling with args: ['C:\\Program Files\\Java\\j2re1.4.2_07\\bin\\javac', '-cla
sspath', 'C:\\jython21\\jython.jar;;.\\jpywork;;C:\\jython21\\Tools\\jythonc;C:\
\jython21\\Demo\\applet\\.;C:\\jython21\\Lib;C:\\jython21', '.\\jpywork\\HelloWo
rld.java', '.\\jpywork\\ButtonFontDemo.java', '.\\jpywork\\HelloApplet.java', '.
\\jpywork\\pawt\\__init__.java', '.\\jpywork\\ButtonDemo.java', '.\\jpywork\\Lab
elDemo.java', '.\\jpywork\\CheckboxDemo.java', '.\\jpywork\\ChoiceDemo.java', '.
\\jpywork\\ListDemo.java', '.\\jpywork\\Converter.java', '.\\jpywork\\Coordinate
sDemo.java']
1  java.io.IOException: CreateProcess: "C:\Program Files\Java\j2re1.4.2_07\bin\j
avac" -classpath C:\jython21\jython.jar;;.\jpywork;;C:\jython21\Tools\jythonc;C:
\jython21\Demo\applet\.;C:\jython21\Lib;C:\jython21 .\jpywork\HelloWorld.java .\
jpywork\ButtonFontDemo.java .\jpywork\HelloApplet.java .\jpywork\pawt\__init__.j
ava .\jpywork\ButtonDemo.java .\jpywork\LabelDemo.java .\jpywork\CheckboxDemo.ja
va .\jpywork\ChoiceDemo.java .\jpywork\ListDemo.java .\jpywork\Converter.java .\
jpywork\CoordinatesDemo.java error=2

Consider using the -C/--compiler command line switch, or setting
the property python.jythonc.compiler in the registry.
ERROR DURING JAVA COMPILATION... EXITING
C:\jython21\Demo\applet>
---------------------------------------------------------------------------------
这是为什么？
 				

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　　　　　　　　　　2005-04-08