added stopwatch_gui py with changes

Author: aishwaryachand

Stopwatch GUI/stopwatch_gui.py

@@ -0,0 +1,74 @@
+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("500x400") #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()