└── Create a simple stopwatch


/Create a simple stopwatch:
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 1 | import tkinter as Tkinter
 2 | from datetime import datetime
 3 | counter = 0
 4 | running = False
 5 | 
 6 | 
 7 | def counter_label(label):
 8 |     def count():
 9 |         if running:
10 |             global counter
11 |             # To manage the intial delay. 
12 |             if counter == 0:
13 |                 display = 'Ready!'
14 |             else:
15 |                 tt = datetime.utcfromtimestamp(counter)
16 |                 string = tt.strftime('%H:%M:%S')
17 |                 display = string
18 | 
19 |             label['text'] = display
20 | 
21 |             # label.after(arg1, arg2) delays by 
22 |             # first argument given in milliseconds 
23 |             # and then calls the function given as second argument. 
24 |             # Generally like here we need to call the 
25 |             # function in which it is present repeatedly. 
26 |             # Delays by 1000ms=1 seconds and call count again. 
27 |             label.after(1000, count)
28 |             counter += 1
29 | 
30 |     # Triggering the start of the counter. 
31 |     count()
32 | 
33 | 
34 | # start function of the stopwatch 
35 | def Start(label):
36 |     global running
37 |     running = True
38 |     counter_label(label)
39 |     start['state'] = 'disabled'
40 |     stop['state'] = 'normal'
41 |     reset['state'] = 'normal'
42 | 
43 | 
44 | # Stop function of the stopwatch 
45 | def Stop():
46 |     global running
47 |     start['state'] = 'normal'
48 |     stop['state'] = 'disabled'
49 |     reset['state'] = 'normal'
50 |     running = False
51 | 
52 | 
53 | # Reset function of the stopwatch 
54 | def Reset(label):
55 |     global counter
56 |     counter = 0
57 |     # If reset is pressed after pressing stop. 
58 |     if not running:
59 |         reset['state'] = 'disabled'
60 |         label['text'] = '00:00:00'
61 |     # If reset is pressed while the stopwatch is running. 
62 |     else:
63 |         label['text'] = '00:00:00'
64 | 
65 | 
66 | root = Tkinter.Tk()
67 | root.title("Stopwatch")
68 | 
69 | # Fixing the window size.
70 | root.minsize(width=250, height=70)
71 | label = Tkinter.Label(root, text='Ready!', fg='black', font='Verdana 30 bold')
72 | label.pack()
73 | f = Tkinter.Frame(root)
74 | start = Tkinter.Button(f, text='Start', width=6, command=lambda: Start(label))
75 | stop = Tkinter.Button(f, text='Stop', width=6, state='disabled', command=Stop)
76 | reset = Tkinter.Button(f, text='Reset', width=6, state='disabled', command=lambda: Reset(label))
77 | f.pack(anchor='center', pady=5)
78 | start.pack(side='left')
79 | stop.pack(side='left')
80 | reset.pack(side='left')
81 | root.mainloop()
82 | 


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