使用Python创建秒表

本文重点介绍在Python中使用Tkinter创建秒表
Tkinter ：Tkinter 是Python的标准 GUI 库。 Python与 Tkinter 结合使用提供了一种快速简便的方式来创建 GUI 应用程序。 Tkinter 为 Tk GUI 工具包提供了一个强大的面向对象接口。开始使用 Tkinter 非常容易，这里有一些示例代码可以让您在Python中使用 Tkinter。

Python3

# Python program to create a
# a new window using Tkinter
# importing the required libraries
import tkinter
 
# creating a object 'top' as instance of class Tk
top = tkinter.Tk()
 
# This will start the blank window
top.mainloop()

输出：

使用 Tkinter 创建秒表

现在让我们尝试使用 Tkinter 模块创建一个程序来创建秒表。
秒表是一种手持式时计，旨在测量从特定时间启动到停止时所经过的时间量。为远距离观看而设计的大型数字版秒表，例如在体育场内，称为秒表。在手动计时中，时钟由一个人按下按钮来启动和停止。在全自动时间，启动和停止都是由传感器自动触发的。
所需模块：我们将仅使用 Tkinter 来创建 GUI，此程序中不会使用其他库。
源代码：

Python3

# Python program to illustrate a stop watch
# using Tkinter
#importing the required libraries
import tkinter as Tkinter
from datetime import datetime
counter = 66600
running = False
def counter_label(label):
    def count():
        if running:
            global counter
   
            # To manage the initial delay.
            if counter==66600:            
                display="Starting..."
            else:
                tt = datetime.fromtimestamp(counter)
                string = tt.strftime("%H:%M:%S")
                display=string
   
            label['text']=display   # Or label.config(text=display)
   
            # label.after(arg1, arg2) delays by 
            # first argument given in milliseconds
            # and then calls the function given as second argument.
            # Generally like here we need to call the 
            # function in which it is present repeatedly.
            # Delays by 1000ms=1 seconds and call count again.
            label.after(1000, count) 
            counter += 1
   
    # Triggering the start of the counter.
    count()     
   
# start function of the stopwatch
def Start(label):
    global running
    running=True
    counter_label(label)
    start['state']='disabled'
    stop['state']='normal'
    reset['state']='normal'
   
# Stop function of the stopwatch
def Stop():
    global running
    start['state']='normal'
    stop['state']='disabled'
    reset['state']='normal'
    running = False
   
# Reset function of the stopwatch
def Reset(label):
    global counter
    counter=66600
   
    # If rest is pressed after pressing stop.
    if running==False:      
        reset['state']='disabled'
        label['text']='Welcome!'
   
    # If reset is pressed while the stopwatch is running.
    else:               
        label['text']='Starting...'
   
root = Tkinter.Tk()
root.title("Stopwatch")
   
# Fixing the window size.
root.minsize(width=250, height=70)
label = Tkinter.Label(root, text="Welcome!", fg="black", font="Verdana 30 bold")
label.pack()
f = Tkinter.Frame(root)
start = Tkinter.Button(f, text='Start', width=6, command=lambda:Start(label))
stop = Tkinter.Button(f, text='Stop',width=6,state='disabled', command=Stop)
reset = Tkinter.Button(f, text='Reset',width=6, state='disabled', command=lambda:Reset(label))
f.pack(anchor = 'center',pady=5)
start.pack(side="left")
stop.pack(side ="left")
reset.pack(side="left")
root.mainloop()

输出：