Power Cost Calculator.py

from tkinter import *

def calc(x, y, z):
    var4 = ((x * y) / 1000) * z / 100
    return var4


b = 1

while b:

    ans = 0
    power = Tk()
    var1 = IntVar()
    var2 = IntVar()
    var3 = DoubleVar()
    var5 = StringVar()

    power.wm_attributes('-topmost', 1)
    power.wm_title("Power Calc")

    powtext = Label(power, text="Watts:")
    powtext.pack()

    wattage = Entry(power, textvariable=var1, width=26)
    wattage.pack()
    wattage.delete(0, END)
    wattage.insert(0, "100")

    powtext2 = Label(power, text="Hours:")
    powtext2.pack()

    time = Entry(power, textvariable=var2, width=26)
    time.pack()
    time.delete(0, END)
    time.insert(0, "24")

    powtext3 = Label(power, text="kWh Cost (cents)")
    powtext3.pack()

    cost = Entry(power, textvariable=var3, width=26)
    cost.pack()
    cost.delete(0, END)
    cost.insert(0, "10")

    powtext4 = Label(power, textvariable=var5)
    powtext4.pack()

    powans = Text(power, width=30, height=1)
    powans.pack()
    powans.insert("1.0", ans)
    powans.config(state=DISABLED)

    def button():
        global v
        watts = var1.get()
        hours = var2.get()
        cents = var3.get()
        ans = calc(watts, hours, cents)
        powans.config(state=NORMAL)
        powans.delete("1.0", END)
        powans.insert("1.0", ans)
        powans.config(state=DISABLED)
        labeltext = []
        labeltext = ['Cost of ', watts, ' watts for ', hours, ' hours:']
        f = ''.join(str(v) for v in labeltext)
        var5.set(f)
        return

    def powquit():
        global b
        b = 0
        power.destroy()

    button = Button(power, text="Calculate", command=button)
    button.pack()

    button_quit = Button(power, text="Quit", command=powquit)
    button_quit.pack()

    mainloop()