delete(0, END) 对我不起作用

Question

delete(0, END) 由于某种原因不起作用。它没有给出任何错误消息，其余代码看起来都很好。 delete(0, END) 不会删除我在 intvar 的输入框中得到的 0，我不知道为什么它不起作用。我在另一个代码中使用删除，它在那里工作。谁能帮帮我？

我遇到问题的代码。

    part1_entry = tk.Entry(Frame1, font=('Helvetica', 12, 'bold'), 
    textvariable=self.a3, validate = 'key', validatecommand = vcmd, width = 11)
    part1_entry.grid(column=0, row=6, sticky=(W), columnspan=1)
    part1_entry.delete(0, END)    

    part2_entry = tk.Entry(Frame1, font=('Helvetica', 12, 'bold'), 
    textvariable=self.a5, validate = 'key', validatecommand = vcmd, width = 11)
    part2_entry.grid(column=0, row=6, sticky=(E), columnspan=1)
    part2_entry.delete(0, END) 

这是我的代码。

import tkinter as tk
from tkinter import ttk
import io
from tkinter import filedialog
E=tk.E
W=tk.W
N=tk.N
S=tk.S
VERTICAL=tk.VERTICAL
END=tk.END


class Demo1(tk.Frame):
    def __init__(self, master):
        tk.Frame.__init__(self, master)
        self.master = master
        self.Frame = tk.Frame(self.master, borderwidth=10)
        self.Frame.grid(column=0, row=0, sticky=(N, W, E, S))

        button1 = tk.Button(self.Frame, text="Special Rk märkning",  command=self.new_window, width = 25)
        button1.grid(column=0, row=0, sticky=(W, E), columnspan=4)
        button2 = tk.Button(self.Frame, text="Billerud kabelmärkningar",  command=self.new_window, width = 25)
        button2.grid(column=0, row=1, sticky=(W, E), columnspan=4)   



    def new_window(self):
        Billerud(self)

class Billerud:
    def __init__(self, master):
        self.master = master
        top1 = tk.Toplevel()
        top1.title("Billerud")
        top1.resizable(width=False, height=False)
        #fönster designern här bästems fönster ramar, rader och columner
        Frame1 = tk.Frame(top1)
        Frame1.grid(column=1, row=0, sticky=(N, W, E, S), padx=5, pady=5)
        Frame1.columnconfigure(0, weight=1)
        Frame1.rowconfigure(0, weight=1)
        #Koden är en del av entry's endast nummer restriktion
        vcmd = (Frame1.register(self.validate),
             '%d', '%i', '%P', '%s', '%S', '%v', '%V', '%W')

        #create text editor
        self.text_entry = tk.Text(Frame1, width=25,height=20) 
        self.text_entry.grid(column=0, row=0, sticky=(W, E))
        scrollbar = tk.Scrollbar(Frame1, orient=VERTICAL)
        scrollbar.grid(column=0, row=0,  sticky=(N, E, S))

        # koppla ihop listbox med scrollbar
        self.text_entry.config(yscrollcommand=scrollbar.set)
        scrollbar.config(command=self.text_entry.yview)

        self.a1 = tk.StringVar()
        self.a2 = tk.StringVar()
        self.a3 = tk.IntVar()
        self.a4 = tk.StringVar()
        self.a5 = tk.IntVar()

        text1 = tk.Label(Frame1, text="Kabelnamn:", font=("Helvetica", 12, "bold")).grid(column=0, row=1, sticky=(W), columnspan=2)
        Kabelnamn_entry = tk.Entry(Frame1, font=('Helvetica', 12, 'bold'), textvariable=self.a1)
        Kabelnamn_entry.grid(column=0, row=2, sticky=(W, E), columnspan=2)

        text2 = tk.Label(Frame1, text="Kabelnummer:", font=("Helvetica", 12, "bold")).grid(column=0, row=3, sticky=(W), columnspan=2)
        Kabelnummer_entry = tk.Entry(Frame1, font=('Helvetica', 12, 'bold'), textvariable=self.a2)
        Kabelnummer_entry.grid(column=0, row=4, sticky=(W, E), columnspan=2)

        text3 = tk.Label(Frame1, text="Parter från:  Till:", font=("Helvetica", 12, "bold")).grid(column=0, row=5, sticky=(W), columnspan=1)

        part1_entry = tk.Entry(Frame1, font=('Helvetica', 12, 'bold'), textvariable=self.a3, validate = 'key', validatecommand = vcmd, width = 11)
        part1_entry.grid(column=0, row=6, sticky=(W), columnspan=1)
        part1_entry.delete(0, END)    

        part2_entry = tk.Entry(Frame1, font=('Helvetica', 12, 'bold'), textvariable=self.a5, validate = 'key', validatecommand = vcmd, width = 11)
        part2_entry.grid(column=0, row=6, sticky=(E), columnspan=1)
        part2_entry.delete(0, END)    

        button1 = tk.Button(Frame1, text="Make",  command=self.funktion, width = 16)
        button1.grid(column=0, row=7, sticky=(W, E), columnspan=4)   

        button2 = tk.Button(Frame1, text="Spara",  command=self.file_save, width = 16)
        button2.grid(column=0, row=8, sticky=(W, E), columnspan=4)

        top1.update()
        top1.resizable(width=False, height=False)     
        top1.mainloop()

    def validate(self, action, index, value_if_allowed,
                       prior_value, text, validation_type, trigger_type, widget_name):
        if text in '0123456789.-+':
            try:
                float(value_if_allowed)
                return True
            except ValueError:
                return False
        else:
            return False

    def file_save(self):                 
        file = tk.filedialog.asksaveasfile(defaultextension=".txt", mode='wt', filetypes = (("txt files","*.txt"),("all files","*.*")))  
        if file:
            data = self.text_entry.get('1.0', END+'-1c')
            file.write(data)
            file.close()

    def funktion(self):
        value1 = (self.a1.get())
        value2 = (self.a2.get())
        value3 = (self.a3.get())
        value4 = (self.a4.get())
        value5 = (self.a5.get())

        for parts in range(value3-1, value5):
            print('{}-{}-{}-{}\n'.format(value1, value2, parts+1, parts+1))
            self.text_entry.insert(END, '{}-{}-{}-{}\n'.format(value1, value2, parts+1, parts+1))
            self.a4.set('{}-{}-{}-{}\n'.format(value1, value2, parts+1, parts+1))

    def close_windows(self):
        self.master.destroy()

def main(): 
    root = tk.Tk()
    app = Demo1(root)
    root.protocol("WM_DELETE_WINDOW")
    root.mainloop()

if __name__ == '__main__':
    main()

Answer 1

我觉得你应该试试：

part1_entry.delete(0, 'end')
part2_entry.delete(0, 'end')

Answer 2

你很幸运，我现在有太多空闲时间。 尝试使用：

self.a3.set("")
self.a5.set("")

也许真正了解 tkinter 的人能够提供更多帮助。