基于关闭计数器显示 Pi 十进制数

Question

目前是 python 的初学者。

我正在尝试创建一个基于 pi (3.14) 的简单 tkinter 应用程序每次他们按 "Next Digit" 它都会增加计数器 +1 并显示下一个十进制数。

# Import the Tkinter functions
from tkinter import *


#####backend function
global counter
counter = 0
pi = '159265358979323846'


def pi_decimal():
    while counter > 0
         pass
def Decimals():
    global counter
    counter +=1
    display_decimal['text'] = counter


# Create a window
application_window = Tk()

# Give the window a title
application_window.title('PI')

# create a button for application window
my_button = Button(application_window,
                   text = 'Next Digit', command = Decimals)

#create a row that shows the number
number_pi = Label(application_window, text = pi)
display_decimal = Label(application_window, text = counter)

#put button into the window
display_decimal.pack()
number_pi.pack()
my_button.pack()

例如，我正在尝试弄清楚如何遍历最多 18 位的小数列表加上 3.14。 counter 0 = 3.14, counter 1 = 3.141, counter 2 = 3.1415 等等。感谢任何形式的帮助:)

Answer 1

你可以这样做：

您的应用主要缺少对 mainloop 的调用。

# Import the Tkinter functions
import tkinter as tk


def decimals():
    global counter
    counter += 1
    try:
        text = pi[counter]
    except IndexError:
        counter = 0
        text = ''
    display_decimal['text'] = f"PI decimal value: {text}"
    display_decimal_ndx['text'] = f"PI decimal index: {counter}" 


if __name__ == '__main__':

    # backend function
    counter = 0
    pi = '159265358979323846'

    # Create a window
    application_window = tk.Tk()

    # Give the window a title
    application_window.title('PI')

    # create a button for application window
    my_button = tk.Button(application_window,
                          text='Next Digit', command=decimals)

    # create a row that shows the number
    number_pi = tk.Label(application_window, text = pi)
    display_decimal = tk.Label(application_window, text='')
    display_decimal_ndx = tk.Label(application_window, text=counter)

    # put button into the window
    display_decimal.pack()
    display_decimal_ndx.pack()
    number_pi.pack()
    my_button.pack()

    application_window.mainloop()

注：

您可能要考虑使用 import tkinter as tk 而不是使全局命名空间混乱。
函数 decimals() 中的 try/except 块避免了枚举完成时讨厌的索引错误。
一个标签显示显示的是哪个小数，另一个标签显示其值。
一旦完成，枚举将重置为第一位小数。

编辑：

您可以这样做来添加数字 Pi 的显示，它会在我们按下按钮时更新显示的小数位数：

import tkinter as tk


def decimals():
    global counter
    counter += 1
    try:
        text = pi[counter]
    except IndexError:
        counter = 4
        text = ''
    display_decimal['text'] = f"PI decimal value: {text}"
    display_decimal_ndx['text'] = f"PI decimal index: {counter}"
    number_pi['text'] = pi[:counter+1]


if __name__ == '__main__':

    # backend function
    counter = 4
    pi = '3.14159265358979323846'

    # Create a window
    application_window = tk.Tk()

    # Give the window a title
    application_window.title('PI')

    # create a button for application window
    my_button = tk.Button(application_window,
                          text='Next Digit', command=decimals)

    # create a row that shows the number
    number_pi = tk.Label(application_window, text = pi[:counter+1])
    display_decimal = tk.Label(application_window, text='')
    display_decimal_ndx = tk.Label(application_window, text=counter)

    # put button into the window
    display_decimal.pack()
    display_decimal_ndx.pack()
    number_pi.pack()
    my_button.pack()

    application_window.mainloop()

基于关闭计数器显示 Pi 十进制数

Displaying Pi decimal number based off counter

python-3.x

math

tkinter

buttonclick

pi

注：

编辑：