Python丨tkinter开发常用的29种功能用法（建议码住）

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在Python软件开发中，tkinter中command功能的作用是：

为按钮、菜单等组件绑定回调函数，用户操作该组件时会触发相应的函数执行。

本文涵盖了各种组件和功能：

1、为Button组件（按钮）绑定回调函数

import tkinter as tk
def say_hello():
    print("Hello World!")

root = tk.Tk()
button = tk.Button(root, text="点我", command=say_hello)
button.pack()
root.mainloop()

2、为Checkbutton组件（多选择钮）绑定回调函数

'''
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'''
import tkinter as tk

def show_selection():
    print("Selection is:", var.get())

root = tk.Tk()

var = tk.BooleanVar()

checkbutton = tk.Checkbutton(root, text="Select me", variable=var, command=show_selection)
checkbutton.pack()

root.mainloop()

3、为Radiobutton组件（单选择钮）绑定回调函数

import tkinter as tk

def show_selection():
    print("Selection is:", var.get())

root = tk.Tk()

var = tk.StringVar()

radiobutton1 = tk.Radiobutton(root, text="Option 1", variable=var, value="Option 1", command=show_selection)
radiobutton2 = tk.Radiobutton(root, text="Option 2", variable=var, value="Option 2", command=show_selection)

radiobutton1.pack()
radiobutton2.pack()

root.mainloop()

4、为Listbox组件（列表组件）绑定回调函数

'''
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'''
import tkinter as tk

def show_selection(event):
    selection = event.widget.curselection()
    print("Selection is:", event.widget.get(selection))

root = tk.Tk()

listbox = tk.Listbox(root)
listbox.insert("end", "Option 1")
listbox.insert("end", "Option 2")
listbox.bind("<<ListboxSelect>>", show_selection)

listbox.pack()

root.mainloop()

5、为Spinbox组件（条框）绑定回调函数

import tkinter as tk

def show_selection():
    print("Selection is:", spinbox.get())

root = tk.Tk()

spinbox = tk.Spinbox(root, values=(1, 2, 3,4,5), command=show_selection)
spinbox.pack()

root.mainloop()

运行后，选择不同的参数，回传到了spinbox组件

6、为Scale组件（滑条）绑定回调函数

import tkinter as tk

def show_selection(value):
    print("Selection is:", value)

root = tk.Tk()

scale = tk.Scale(root, from_=0, to=100, command=show_selection)
scale.pack()

root.mainloop()

7、为Scrollbar组件（滚动条）绑定回调函数

'''
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'''
import tkinter as tk

def scroll(event):
    scrollbar.set(event.widget.get())

root = tk.Tk()

scrollbar = tk.Scrollbar(root, orient="vertical")
scrollbar.pack(side="right", fill="y")

listbox = tk.Listbox(root, yscrollcommand=scrollbar.set)
for i in range(100):
    listbox.insert("end", "Option " + str(i))

scrollbar.config(command=listbox.yview)
listbox.bind("<MouseWheel>", scroll)

listbox.pack()

root.mainloop()

8、为Canvas组件（画布）绑定回调函数

import tkinter as tk

def draw_line(event):
    canvas.create_line(0, 0, event.x, event.y)

root = tk.Tk()

canvas = tk.Canvas(root, width=300, height=300)
canvas.bind("<Button-1>", draw_line)

canvas.pack()

root.mainloop()

9、为Text组件（文本框）绑定回调函数

import tkinter as tk

def count_characters(event):
    text = event.widget.get("1.0", "end")
    count = len(text.replace("\n", ""<