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一个秒表。
秒表是一种手持式时计，设计用于测量从激活的特定时间到停用该部件时所经过的时间量。设计用于远距离观看的秒表的大型数字版本，如体育场，被称为秒钟。在手动定时中，时钟由按下按钮的人启动和停止。在全自动时间内，传感器会自动触发启动和停止。

必需的模块：我们只会使用tkinter来创建gui，并且在此程序中不会使用其他库。

# Python program to illustrate a stop watch

# using Tkinter

#importing the required libraries

import tkinter as Tkinter

counter = -1

running = False

def counter_label(label):

def count():

if running:

global counter

# To manage the intial delay.

if counter==-1:

display="Starting..."

else:

display=str(counter)

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=-1

# 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()

start = Tkinter.Button(root, text='Start',

width=15, command=lambda:Start(label))

stop = Tkinter.Button(root, text='Stop',

width=15, state='disabled', command=Stop)

reset = Tkinter.Button(root, text='Reset',

width=15, state='disabled', command=lambda:Reset(label))

start.pack()

stop.pack()

reset.pack()

root.mainloop()