Question

在从根类中提出第一帧后，我一直试图从第一类中提出第二帧，但是每次都会出错 类型对象“ root”没有属性“ tk” 。但是我可以从根类提高第二个框架，但这不是我想要的。我想从前一帧开始提高每个连续的帧，因为我希望在整个程序中有条件地提高4帧。如果我想的都是错误的方法，请提供一种解决方法，以下是我的代码。

import mysql.connector as sql
from os import getenv
from datetime import date
from ttkthemes import themed_tk as ttkt
from tkinter import ttk
import tkinter as tk
from tkinter import messagebox as mg

class root(ttkt.ThemedTk):
    def __init__(self, *args):
        ttkt.ThemedTk.__init__(self, *args)
        self.geometry('800x450')
        self.resizable(0, 0)
        self.set_theme('arc') #equilux
        self.config(background = '#EFEFEF')
        self.navbar()
        self.show_frame(home_first) 
#### I'm able to call Class_second frame from changing the value here

    def show_frame(self, cont):
        frame = cont(self)
        frame.pack(side = 'right', expand = True, fill= 'both', ipadx = 210)
        frame.tkraise()

    def show_Class_frame(self):
        self.show_frame(self, Class_second)

    def about(self):
    ....

    def session(self): 
    ....

    #NAVBAR______________________________
    def navbar(self):
        fl = tk.Frame(self, background = '#0077CC')
        fl.pack(side = 'left', expand = 1, fill= 'both')
        #NAVBAR's internal items______________________________
        ....

class home_first(tk.Frame):
    def __init__(self, parent):
        tk.Frame.__init__(self, parent)
        ....
        btnt = ttk.Button(btnfrm, text = 'Teachers', style = 'fntb.TButton', command = self.tch_sel)
        # I want to use these to get to second frame
        btnt.pack(pady = (0,8))
        btns = ttk.Button(btnfrm, text = 'Students', style = 'fntb.TButton', command = self.std_sel)
        btns.pack()

    def tch_sel(self):
        sel = 0 #for teachers direct to page 3 not Class_second Frame
        root.show_Class_frame(root)

    def std_sel(self):
        sel = 1 #for students move to Class_second frame
        root.show_Class_frame(root)

class Class_second(tk.Frame):
    def __init__(self, parent):
        tk.Frame.__init__(self, parent)

class vote_third(tk.Frame):
    pass #from here i need to bring 4th frame

class done_fourth(tk.Frame):
    pass #here there will be like 3 button each going either to Home, Class or Vote frames
if __name__ == '__main__':
    app = root()
    app.mainloop()

追踪

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\Sagar\Anaconda3\lib\tkinter\__init__.py", line 1705, in __call__
    return self.func(*args)
  File "d:\Code\Python\py_project_votm\vm_vot_main_oop.py", line 76, in tch_sel
    root.show_Class_frame(root)
  File "d:\Code\Python\py_project_votm\vm_vot_main_oop.py", line 31, in show_Class_frame
    self.show_frame(self, Class_second)
  File "d:\Code\Python\py_project_votm\vm_vot_main_oop.py", line 26, in show_frame
    frame = cont(self)
  File "d:\Code\Python\py_project_votm\vm_vot_main_oop.py", line 84, in __init__
    tk.Frame.__init__(self, parent)
  File "C:\Users\Sagar\Anaconda3\lib\tkinter\__init__.py", line 2744, in __init__
    Widget.__init__(self, master, 'frame', cnf, {}, extra)
  File "C:\Users\Sagar\Anaconda3\lib\tkinter\__init__.py", line 2292, in __init__
    BaseWidget._setup(self, master, cnf)
  File "C:\Users\Sagar\Anaconda3\lib\tkinter\__init__.py", line 2262, in _setup
    self.tk = master.tk
AttributeError: type object 'root' has no attribute 'tk'

此外，有人可以告诉我还有什么其他方法可以更好地执行此程序。对不起，英语不好。

Answer 1

部分问题是您没有使用PEP8命名约定，这使您的代码难以阅读和理解。阅读代码时，我们会根据命名约定进行假设，而由于不使用命名约定，最终会做出错误的假设。

具体来说，您所有的课程都必须以大写字母（Root，Vote_third，Done_fourth）开头。当我们阅读您的代码并看到类似root.some_method()的内容时，我们假设您正在实例上调用some_method()。但是，就您而言，您是在类本身上调用它。

问题是这一行：

root.show_Class_frame(root)

root是一个类，而不是一个类的 instance 。该参数最终成为另一个小部件的母版，但是您不能将一个类用作母版。您必须使用小部件类的实例作为主实例。

您已经在创建名为root的{{1}}实例。您无需致电app，而需要致电root.show_Class_frame()。

app.show_Class_frame

此外，如注释中所述，def tch_sel(self): sel = 0 #for teachers direct to page 3 not Class_second Frame app.show_Class_frame() def std_sel(self): sel = 1 #for students move to Class_second frame app.show_Class_frame()需要更改为self.show_frame(self, Class_second)。

如何在Tkinter的框架类中提高框架类

1 个答案: