Merge pull request avinashkranjan#801 from aishwaryachand/stopwatch

Stopwatch GUI

Author: avinashkranjan

Stopwatch GUI/README.md

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+# Stopwatch GUI
+
+This is a Stopwatch GUI using which user can measure the time elapsed using the start and pause button. User can also use the reset button to reset the stopwatch and exit button to close the window.
+
+## Dependencies
+You will use `Tkinter` and `time` python module .
+
+## Sample Output 
+On running `Stopwatch_gui.py`.
+
+[![stopwatch-gui1.png](https://i.postimg.cc/2yYGVSY0/stopwatch-gui1.png)](https://postimg.cc/1nWwdPfF)
+
+### After using Start button
+[![Capture.png](https://i.postimg.cc/76gbwzLD/Capture.png)](https://postimg.cc/S2xmGJ8t)
+
+## Author
+[Aishwarya Chand](https://github.com/aishwaryachand)

Stopwatch GUI/stopwatch1.png

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+import tkinter as tk
+import tkinter.font as TkFont
+from datetime import datetime
+
+def timer():
+    global work
+    if work:
+        now = str(txt_var.get())
+        m,s = map(int, now.split(":"))
+        m=int(m)
+        s= int(s)
+        if(s<59):
+            s+=1
+        elif(s==59):
+                s=0
+                if(m<59):
+                    m+=1
+                elif(m==59):
+                    m=0
+        if(m<10):
+            m = str(0)+str(m)
+        else:
+            m = str(m)
+        if(s<10):
+            s=str(0)+str(s)
+        else:
+            s=str(s)
+        now =m+":"+s
+
+        txt_var.set(now)
+        if work:
+            root.after(1000,timer)
+#start function
+def start():
+    global work   
+    if not work:
+        work = True
+        timer()              
+        
+#stop function        
+def pause():
+    global work
+    work = False
+
+#reset function   
+def reset():
+    global work 
+    if not work:
+        txt_var.set('0:00')
+  
+
+if __name__ == "__main__" :        
+    work = False
+    
+    root = tk.Tk()
+    root.geometry("500x221") #width x height
+    root.title("My StopWatch")
+    
+    txt_var = tk.StringVar()
+    txt_var.set('0:00')#initial display of string
+    root.config(background = "lavender")
+    
+    fontstyle = TkFont.Font(family ="Helvetica",size = 60,)
+    tk.Label(root,textvariable=txt_var,font=fontstyle,).pack()
+    
+    #creating the buttons for start,stop and reset
+    T=tk.Text(root ,height =0.7 ,width = 9)
+    T.pack()
+    T.insert(tk.END," mm : ss ")
+    tk.Button(root,text = "Start",command=start,bg ='misty rose').pack(fill = 'x')
+    tk.Button(root,text='Pause',command = pause,bg ='misty rose').pack(fill='x')
+    tk.Button(root,text = 'Reset',command = reset,bg ='misty rose').pack(fill='x')
+    tk.Button(root,text = 'Exit',command = root.destroy,bg ='misty rose').pack(fill='x')
+    root.mainloop()