Question

我是一个蟒蛇新手，并在第10章中找到了以下内容：

当我在python 2.7.10中运行代码时，它给出了：

Traceback (most recent call last):
File "C:\Users\Dave\learnpython\py3e_source\chapter10\click_counter.py", line 32, in <module>
app = Application(root)
File "C:\Users\Dave\learnpython\py3e_source\chapter10\click_counter.py", line 10, in __init__
super(Application, self).__init__(master)
TypeError: must be type, not classobj

这本书写于理解python 3＆gt;会被使用。但是我有什么办法可以在2.7.10中解决这个问题吗？我不知道该怎么做。

原始代码，除了'from tkinter'被更改为'from Tkinter'：

# Click Counter
# Demonstrates binding an event with an event handler

from Tkinter import *

class Application(Frame):
    """ GUI application which counts button clicks. """ 
    def __init__(self, master):
        """ Initialize the frame. """
        super(Application, self).__init__(master)  
        self.grid()
        self.bttn_clicks = 0    # the number of button clicks
        self.create_widget()

    def create_widget(self):
        """ Create button which displays number of clicks. """
        self.bttn = Button(self)
        self.bttn["text"]= "Total Clicks: 0"
        self.bttn["command"] = self.update_count
        self.bttn.grid()

    def update_count(self):
        """ Increase click count and display new total. """
        self.bttn_clicks += 1
        self.bttn["text"] = "Total Clicks: " + str(self.bttn_clicks)

# main
root = Tk()
root.title("Click Counter")
root.geometry("200x50")

app = Application(root)

root.mainloop()

Answer 1

我没有在任何项目中使用过Tk，但我怀疑Frame不是使用新式类创建的，super()仅适用于新式（https://docs.python.org/2/library/functions.html#super）。尝试将__init__方法更改为：

def __init__(self, master):
    """ Initialize the frame. """
    Frame.__init__(self, master)   # <-- CHANGED  
    self.grid()
    self.bttn_clicks = 0
    self.create_widget()

源代码不会在python 2.7.10中运行

1 个答案: