python之属性错误 : HelloWorld Instance has no attribute main

我收到这个错误

Traceback (most recent call last): 
    File "helloworld.py", line 66, in module   
       hello.main() 
AttributeError: Helloworld instance has no attribute 'main' 

我在 Linux 机器上运行下面给出的代码

#!/usr/bin/env python 
 
# example helloworld.py 
import pygtk 
pygtk.require('2.0') 
import gtk 
 
class HelloWorld: 
 
    # This is a callback function. The data arguments are ignored 
    # in this example. More on callbacks below. 
    def hello(self, widget, data=None): 
        print "Hello World" 
 
    def delete_event(self, widget, event, data=None): 
        # If you return FALSE in the "delete_event" signal handler, 
        # GTK will emit the "destroy" signal. Returning TRUE means 
        # you don't want the window to be destroyed. 
        # This is useful for popping up 'are you sure you want to quit?' 
        # type dialogs. 
        print "delete event occurred" 
 
        # Change FALSE to TRUE and the main window will not be destroyed 
        # with a "delete_event". 
        return False 
 
    def destroy(self, widget, data=None): 
        print "destroy signal occurred" 
        gtk.main_quit() 
 
    def __init__(self): 
        # create a new window 
        self.window = gtk.Window(gtk.WINDOW_TOPLEVEL) 
 
        # When the window is given the "delete_event" signal (this is given 
        # by the window manager, usually by the "close" option, or on the 
        # titlebar), we ask it to call the delete_event () function 
        # as defined above. The data passed to the callback 
        # function is NULL and is ignored in the callback function. 
        self.window.connect("delete_event", self.delete_event) 
 
        # Here we connect the "destroy" event to a signal handler.   
        # This event occurs when we call gtk_widget_destroy() on the window, 
        # or if we return FALSE in the "delete_event" callback. 
        self.window.connect("destroy", self.destroy) 
 
        # Sets the border width of the window. 
        self.window.set_border_width(10) 
 
        # Creates a new button with the label "Hello World". 
        self.button = gtk.Button("Hello World") 
 
        # When the button receives the "clicked" signal, it will call the 
        # function hello() passing it None as its argument.  The hello() 
        # function is defined above. 
        self.button.connect("clicked", self.hello, None) 
 
        # This will cause the window to be destroyed by calling 
        # gtk_widget_destroy(window) when "clicked".  Again, the destroy 
        # signal could come from here, or the window manager. 
        self.button.connect_object("clicked", gtk.Widget.destroy, self.window) 
 
        # This packs the button into the window (a GTK container). 
        self.window.add(self.button) 
 
        # The final step is to display this newly created widget. 
        self.button.show() 
 
        # and the window 
        self.window.show() 
 
    def main(self): 
        # All PyGTK applications must have a gtk.main(). Control ends here 
        # and waits for an event to occur (like a key press or mouse event). 
        gtk.main() 
 
# If the program is run directly or passed as an argument to the python 
# interpreter then create a HelloWorld instance and show it 
if __name__ == "__main__": 
    hello = HelloWorld() 
    hello.main() 

这是一个缩进问题吗？如何解决？ 我尝试在互联网上搜索，但没有帮助。 这与 pyGTK 教程中给出的代码相同。 请帮忙。

请您参考如下方法:

我只是将这段代码复制到我的 Linux 机器上并运行它，它运行良好，没有任何错误。你是从命令行运行这个吗？喜欢 $python helloworld.py 吗？或者您是否尝试通过 Python 控制台 session 运行它？

缩进似乎不是问题。您运行的是哪个版本的 Python？