dexter CSCI change maker

from Tkinter import *
import tkMessageBox

class Change_Calculator(object):
    def __init__(self):
        self.root = Tk()
        self.root.wm_title("Change Calculator")
        self.label1 = Label (self.root, text= "Enter item price:")
        self.label2 = Label (self.root, text= "Enter amount tendered:")
        self.label1.pack()
        self.label2.pack()
        self.denmVals = [10000, 2000, 1000, 500, 100, 25, 10, 5, 1]
        self.denominations = ["Hundred", "Twenties:", "Tens:", "Fives:", "Ones:", "Quarters:", "Dimes:", "Nickels:", "Pennies:"]
		self.entrytext1 = StringVar()
        Entry(self.rot, textvariable=self.entrytext1).pack()
        self.entrytext2 = StringVar()
        Entry(self.root, textvariable=self.entrytext2).pack()
        
        self.buttontext1 = StringVar()
        self.buttontext1.set("Calculate")
        Button(self.root, textvariable=self.buttontext1, command=self.clicked1).pack()
        
        self.label = Label (self.root, text="")
		self.label.pack()
        
        self.root.mainloop()
    def clicked1(self):
        input = self.entrytext1.get()
    def getChangeSanitize(self):
        while True:
            try:
                itemPrice = float(input("Price of the item:\n$"))

except ValueError:
                print("Please enter only numbers and a single decimal point, if required.\n")
                continue
            else:
                break
        while True:
            try:
                cashTendered = float(input("\nCash tendered:\n$"))
            except ValueError:
                print("Please enter only numbers and a single decimal point, if necessary.\n")
                continue
            else:
                break
        if cashTendered<itemPrice:
            while True:
                try:
                    cashTendered = float(input("\nTendered amount must exceed $"+str(itemPrice)+"\n\nCash Tendered?\n"))
                except ValueError:
                    print("Please enter only numbers and a single Decimal point, if required.\n")
                    continue
                else:
                    break
        return int((100*cashTendered-100*itemPrice))

def denomsCalc(self, denmVals, change):
        denmsRtrn = []
        for i in self.denmVals:
            if i<=change:
                denmsRtrn.append(str(int(change/i)))
                change = change%i
            else:
                denmsRtrn.append(str(0))
        return denmsRtrn

def printChange(self, denominations, denmRtrn):
        print("\n")
        n=0
        for i in self.denominations:
            if int(denmRtrn[n]) >0:
                print(i + denmRtrn[n])
            else:
                pass
            n+=1

def calculateChange(self):
        change=self.getChangeSanitize()
        denomsRtrn=self.denomsCalc(self.denmVals, change)
        self.printChange(self.denominations, denomsRtrn)

Refund = Change_Calculator()
Refund.calculateChange()
pause = input("\n\nPress ENTER to EXIT")

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