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POpython beginner: interaction of classes
 

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    <p>What is the problem in the below code? I think due to the last argument it throws exception when calling menubar?</p> <p>The app is supposed to be a simple text editor and I want to have the menu declaration in a separate class. When I run the script, the textfield gets generated successfully, but without menubar. When I quit the application, the following error message occurs.</p> <pre><code>""" Traceback (most recent call last): File "Editor_play.py", line 41, in &lt;module&gt; menu = Menubar(window, textfield.text) File "Editor_play.py", line 20, in __init__ menubar = Menu(window) File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk/Tkinter.py", line 2580, in __init__ File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk/Tkinter.py", line 1974, in __init__ _tkinter.TclError: this isn't a Tk applicationNULL main window """ from Tkinter import * import tkFileDialog class Textfield(object): def __init__(self, window): self.window = window window.title("text editor") self.scrollbar = Scrollbar(window) self.scrollbar.pack(side="right",fill="y") self.text = Text(window,yscrollcommand=self.scrollbar.set) self.scrollbar.config(command=self.text.yview) self.text.pack() window.mainloop() class Menubar(object): def __init__(self, window, text): self.window = window self.text = text menubar = Menu(window) filemenu = Menu(menubar) filemenu.add_command(label="load",command=self.load) filemenu.add_command(label="save as",command=self.saveas) menubar.add_cascade(label="file",menu=filemenu) window.config(menu=menubar) def load(self): self.file = tkFileDialog.askopenfile() self.text.delete(1.0, END) if self.file: self.text.insert(1.0, self.file.read()) def saveas(self): self.file = tkFileDialog.asksaveasfile() if self.file: self.file.write(self.text.get(1.0, END)) window = Tk() textfield = Textfield(window) menu = Menubar(window, textfield.text) </code></pre>
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