下面这个例子来自 python 编程金典
在类 LabelDemo中,self显然是 LabelDemo类的实例,而该类是Frame类的子类
也就是self 是一个容器,它用来存放后面的三个label
那么我就看不明白下面高亮的一句了.
self 不就已经是顶层配件了吗?self.master 是谁?
书中说,每个子组件都有名为master的一个属性,它引用该子组件的父组件,在高亮的一行访问的是LabelDemo的父组件(顶级组件),并调用title方法将gui的标题更改成
Labels

莫非Frame 及其子对象并非top配件?最顶层的配件是 window? 迷惑中

# Fig. 10.4: fig10_04.py
# Label demonstration.

from Tkinter import *

class LabelDemo( Frame ):
   """Demonstrate Labels"""

   def __init__( self ):
      """Create three Labels and pack them"""

      Frame.__init__( self )   # initializes Frame instance

      # frame fills all available space
      self.pack( expand = YES, fill = BOTH )
      self.master.title( "Labels" )

      self.Label1 = Label( self, text = "Label with text" )

      # resize frame to accommodate Label
      self.Label1.pack()

      self.Label2 = Label( self,
         text = "Labels with text and a bitmap" )

      # insert Label against left side of frame
      self.Label2.pack( side = LEFT )

      # using default bitmap image as label
      self.Label3 = Label( self, bitmap = "info" )
      self.Label3.pack( side = LEFT )

def main():
   LabelDemo().mainloop()  # starts event loop

if __name__ == "__main__":
   main()


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