from tkinter import *
t = 0
def set():
global t
t = t + int(entry.get())
return t
def start():
global t
if t > 0:
lbl.config(text=t)
t = t - 1
lbl.after(1000,start)
return t
elif t == 0:
lbl.config(text="go")
root = Tk()
root.geometry("380x350")
root.config(bg="black")
Label(root, text="Count Down Timer", font=("bell mt", 30),bg="black",fg="#00ff00").grid(row=0, column=0, padx=20)
Label(root,text="Select the seconds",font=("bell mt",20),bg="black",fg="#00ff00").grid(row=1,column=0,padx=20)
entry = Entry(root, font=("castellar", 15),fg="black")
entry.grid(row=2, column=0, padx=20,pady=15)
b1 = Button(root, text='Set Timer', font=("bell mt", 20),bg="black",fg="#00ff00",width=10,height=1, command=set)
b1.grid(row=3, column=0, padx=20,pady=10)
b2 = Button(root, text='Start Timer', font=("bell mt", 20),bg="black",fg="#00ff00",width=10,height=1, command=start)
b2.grid(row=4, column=0, padx=20,pady=10)
lbl = Label(root, text="", font=("algerian", 30),fg="#00ff00",bg="black")
lbl.grid(row=5, column=0, padx=20)
root.mainloop()
