python tip calculator

import re, sys

def getTip():

   while True:

      billamount = raw_input("Please enter bill amount in decimal format --> ")

      try:
         mybill = float(billamount)
         break

      except:
         pass
         e = sys.exc_info()[0]
         print("ERROR: %s" % e )
         print("***Amount entered is not a valid decimal format***")

   while True:

      tippercent = raw_input("Please enter percentage of tip amount in as an integer --> ")

      try:
         mytip = int(tippercent)
         break

      except:
         pass
         e = sys.exc_info()[0]
         print( "Error: %s" % e )
         print("***Tip percentage not entered in valid round number format.***")


   tipdecimal = mytip * 0.01

   tipamount = mybill * tipdecimal

   total = mybill + tipamount

   print("Your " + str(tippercent) + "% tip amount for bill of " + str(mybill) + " is: {0:0.2f}".format(tipamount))

   print("Your total bill is: {0:0.2f}".format(total))

   newtip = 0

getTip()

while True:

   newtip = raw_input("Would you like to calculate another tip? Y/N --> ")

   try:
      matchY = re.search(r'(?i)Y', newtip)
      matchN = re.search(r'(?i)N', newtip)

      if matchY:
         getTip()

      if matchN:
         print("Goodbye!")
         sys.exit()

      else:
         pass

   except:
      pass
      sys.exit()

sys.exit()