如何在str中保存条目计数器并在文本字段中显示？

Question

使用这样的例子，我想计算条目数。并用文本字段中的条目数表示字符串。例如：

1: number of entries(1)
21: number of entries(2)
...

我应该把反变量放在哪里？你知道吗

import random
from tkinter import *

class MyApp(Frame):

    def __init__(self, master):
        super(MyApp, self).__init__(master)
        self.grid()
        self.create_widgets()        

    def create_widgets(self):

        Label(self, text = 'Your number:').grid(row = 0, column = 0, sticky = W)
        self.num_ent = Entry(self)
        self.num_ent.grid(row = 0, column = 1, sticky = W)
        Button(self, text = 'Check', command = self.update).grid(row = 0, column = 2, sticky = W)
        self.user_text = Text(self, width = 50, height = 40, wrap = WORD)
        self.user_text.grid(row = 2, column = 0, columnspan = 3)

    def update(self):

        guess = self.num_ent.get()
        guess += '\n'
        self.user_text.insert(0.0, guess)

root = Tk()
root.geometry('410x200')
root.title('Entries counter')
app = MyApp(root)
root.mainloop()

Answer 1

如果我正确地理解了您想要什么，只需保持按钮按下次数的计数，就可以在__init__中定义一个计数变量，如

self.count = 0

增加并以update格式打印

def update(self):
    self.count += 1
    guess = self.num_ent.get()
    guess += '\n'
    self.user_text.insert(0.0, 'Guess #{}: {}'.format(self.count, guess))