python tkinter

Question

对这段代码中一些步骤不理解

一个窗口拥有5*5按钮的划分，按钮上的数字是随机赋予的，最下面那条label是计时器，游戏规则
是从25个数字中找到最小的数字，然后点击，按钮上的数字立刻DISABLED（变成灰色），当点击
第一个按钮的同时，下面label也开始计时（按秒数算），然后找第二小的数字, 以此类推，25个数
字全部点到，看谁用时最短
提问在注释里

import tkinter as tk
import random
from random import randint

def tick():
    global clock_val, after_id
    if clock_started:
        clock_val += 1
        clock_lab["text"] = str(clock_val)
        after_id = clock_lab.after(1000, tick)
        
def click1(event):
    global clock_started
    if not clock_started:#下面已经把clock_started设置成False了，not clock_started就是True，clock_started的状态一直是False，这里的if应该用不到吧
        clock_started = True
        clock_lab.after(1000, tick)
    clicked_btn = event.widget#这条代码在这里起什么作用？
    clicked_val = int(clicked_btn["text"])
    if clicked_val == number[0]:
        clicked_btn["state"] = tk.DISABLED
        del number[0]
    if len(number) == 0:
        clock_started = False
        clock_lab.after_cancel(after_id)


window=tk.Tk()

window.title("Clicker")

number=[]
for i in range(25):
    ran_number=random.randint(1,999)
    while ran_number in number:
        ran_number=random.randint(1,999)
    number.append(ran_number)
for i in range(25):
    button_1=tk.Button(window, text=str(number[i]),width=10)
    button_1.grid(row=i%5,column=i//5)
    button_1.bind("<Button-1>",click1)


number.sort()
clock_val = 0
clock_lab = tk.Label(window, text=str(clock_val))
clock_lab.grid(column=2, row=5)
clock_started = False#这里为什么要设置成False
window.mainloop()

Answer 1

import tkinter as tk
import random
from random import randint
 
def tick():
    global clock_val, after_id
    if clock_started:
        clock_val += 1
        clock_lab["text"] = str(clock_val)
        after_id = clock_lab.after(1000, tick)
        
def click1(event):
    global clock_started
    if not clock_started:#需要，主要是为了不执行clock_lab.after(1000, tick)这句，要不连续点击会生成多个延时,这样假设1秒内点了3次按钮，那么将会在1s后同时执行tick+3，这样计时就错误了
        clock_started = True
        clock_lab.after(1000, tick)
    clicked_btn = event.widget#widget是当前点击的按钮控件，更多属性参考这篇文章http://c.biancheng.net/tkinter/event.html
    clicked_val = int(clicked_btn["text"])
    if clicked_val == number[0]:
        clicked_btn["state"] = tk.DISABLED
        del number[0]
    if len(number) == 0:
        clock_started = False
        clock_lab.after_cancel(after_id)
 
 
window=tk.Tk()
 
window.title("Clicker")
 
number=[]
for i in range(25):
    ran_number=random.randint(1,999)
    while ran_number in number:
        ran_number=random.randint(1,999)
    number.append(ran_number)
for i in range(25):
    button_1=tk.Button(window, text=str(number[i]),width=10)
    button_1.grid(row=i%5,column=i//5)
    button_1.bind("<Button-1>",click1)
 
 
number.sort()
print(number)
clock_val = 0
clock_lab = tk.Label(window, text=str(clock_val))
clock_lab.grid(column=2, row=5)
clock_started = False#这个是标记是否开始游戏的变量，默认为False尚未开始，在点击按钮后再开始并且计时
window.mainloop()