added stopwatch script

Author: sagnik-p

GUI-Stopwatch/stopwatch.py

@@ -0,0 +1,81 @@
+## tkinter and time modules are inbuilt
+from tkinter import *
+import time
+
+def run():
+    global root
+    root = Tk()
+    root.title("Stopwatch APP")
+    width = 400
+    height = 160
+    screen_width = root.winfo_screenwidth()
+    screen_height = root.winfo_screenheight()
+    x = (screen_width / 2) - (width / 2)
+    y = (screen_height / 2) - (height / 2)
+    root.geometry("%dx%d+%d+%d" % (width, height, x, y))
+    Top = Frame(root)
+    Top.pack(side=TOP)
+    stopWatch = StopWatch(root)
+    stopWatch.pack(side=TOP,pady=15)
+    Bottom = Frame(root, width=400)
+    Bottom.pack(side=BOTTOM)
+    Start = Button(Bottom, text='Start', command=stopWatch.Start, width=20, height=2, bg="green")
+    Start.pack(side=LEFT)
+    Stop = Button(Bottom, text='Stop', command=stopWatch.Stop, width=20, height=2, bg="red")
+    Stop.pack(side=LEFT)
+    Reset = Button(Bottom, text='Reset', command=stopWatch.Reset, width=15, height=2)
+    Reset.pack(side=LEFT)
+    root.config(bg="black")
+    root.mainloop()
+
+
+class StopWatch(Frame):
+    def __init__(self, parent=None, **kw):
+        '''When object is initialized'''
+        Frame.__init__(self, parent, kw)
+        self.startTime = 0.0
+        self.nextTime = 0.0
+        self.onRunning = 0
+        self.timestr = StringVar()
+        self.MakeWidget()
+    def Updater(self):
+        '''update the time shown'''
+        self.nextTime = time.time() - self.startTime
+        self.SetTime(self.nextTime)
+        self.timer = self.after(1, self.Updater)
+    def MakeWidget(self):
+        '''make widget for displaying time'''
+        timeText = Label(self, textvariable=self.timestr, font=("callibri", 50), fg="yellow", bg="grey")
+        self.SetTime(self.nextTime)
+        timeText.pack(fill=X, expand=NO, pady=2, padx=2)
+    def SetTime(self, nextElap):
+        '''set time that is to be displayed'''
+        mins = int(nextElap / 60)
+        secs = int(nextElap - mins * 60.0)
+        milisecs = int((nextElap - mins * 60.0 - secs) * 100)
+        self.timestr.set('%02d:%02d:%02d' % (mins, secs, milisecs))
+    def Start(self):
+        '''start stopwatch'''
+        if not self.onRunning:
+            self.startTime = time.time() - self.nextTime
+            self.Updater()
+            self.onRunning = 1
+    def Stop(self):
+        '''stop stopwatch'''
+        if self.onRunning:
+            self.after_cancel(self.timer)
+            self.nextTime = time.time() - self.startTime
+            self.SetTime(self.nextTime)
+            self.onRunning = 0
+    def Reset(self):
+        '''reset stopwatch'''
+        self.startTime = time.time()
+        self.nextTime = 0.0
+        self.SetTime(self.nextTime)
+
+
+
+
+
+if __name__ == '__main__':
+    run()