Question

我正在尝试更新tkinter标签和按钮中的信息，而不重新绘制整个屏幕。我使用的是Python 3，Raspberry Pi和Idle。我有一个简单的例子，说明我要做的事情。我在这里看到的评论表明我需要学习操纵stringvariable或IntVar等等，但我的书在这方面完全没有用。在这个例子中，我希望按钮之间的数字跟踪数字的值，因为它随按钮按下而改变。

##MoreOrLess.01.py
from tkinter import *  

global number
number = 5

root = Tk()
root.title("Test Buttons")

def Less():
    global number
    number -= 1
    print ("The number is now ", number)

def More():
    global number
    number += 1
    print("The number is now ", number)

def MakeLabel(number):
    textvariable = number
    label1 = Label(root, text = "Pick a button please.").pack(pady=10)
    btnL = Button(root, text = "More", command = More).pack(side = LEFT)  
    btnR = Button(root, text = "Less", command = Less).pack(side = RIGHT)
    label2 = Label(root, text = number).pack(pady = 20)

MakeLabel(number)

Answer 1

您不仅要自己写一本书，还要查看tkinter的官方documentation。在您的情况下，您必须使用set()和get()方法创建IntVar类型的变量，并且当您想要通过textvariable链接该变量时。

from tkinter import *  

root = Tk()
root.title("Test Buttons")

number = IntVar()
number.set(5)

def Less():
    number.set(number.get() - 1)
    print ("The number is now ", number.get())

def More():
    number.set(number.get() + 1)
    print("The number is now ", number.get())

def MakeLabel(number):
    textvariable = number
    label1 = Label(root, text = "Pick a button please.").pack(pady=10)
    btnL = Button(root, text = "More", command = More).pack(side = LEFT)  
    btnR = Button(root, text = "Less", command = Less).pack(side = RIGHT)
    label2 = Label(root, textvariable = number).pack(pady = 20)

MakeLabel(number)
root.mainloop()

在Python Tkinter小部件中更改（更新）文本

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