Python [TUT]How to write a calculator in Python 2.6[TUT]

Code
def FF():



    print "Welcome to Chris' ten function calulator program!"

    print "--"

    print



    print "Please Select a function"

    print "=="



    print "1 Addition"

    print "2 Subtraction"

    print "3 Multiplication"

    print "4 Division"

    print "5 Exponent"

    print "6 Square Root"

    print "7 Area Rectangle"

    print "8 Area Circle"

    print "9 Circumference"

    print "10 Absolute Value"



    function = input("> ")



    if function==1:

  addend1 = input("Please enter addend ")

  addend2 = input("Please enter addend ")

  sum = addend1+addend2

  print "Your function has been completed"

  print "Sum is", sum

  raw_input("Press<enter>")

    elif function==2:

  minuend = input("Please enter minuend ") 

  subtrahend = input("Please enter subtrahend ")

  difference = minuend-subtrahend

  print "Your function has been completed"

  print "The difference is", difference

  raw_input("Press<enter>")

    elif function==3:

  multiplicand = input("Please enter multiplicand ")

  multiplier = input("Please enter multiplier ")

  product = multiplicand*multiplier

  print "Your function has been completed"

  print "The product is", product

  raw_input("Press<enter>")

    elif function==4:

  dividend = input("Please enter dividend ")

  divisor = input("Please enter divisor ")

  quotient = dividend/divisor

  print "Your function has been completed"

  print "The quotient is", quotient

  raw_input("Press<enter>")

    elif function==5:

  Base = input("Please enter base ")

  Power = input("Please enter power ")

  Answer = Base**Power

  print "Your function has been completed"

  print "The answer is", Answer

  raw_input("Press<enter>")

    elif function==6:

  import math

  RadicalTerm = input("Please enter radical term ")

  Answer = math.sqrt(RadicalTerm)

  print "Your function has been completed"

  print "The answer is", Answer

  raw_input("Press<enter>")

    elif function==7:

  width = input("Please enter width ")

  height = input(" Please enter height ")

  AreaRectangle = width*height

  print "Your function has been completed"

  print "The Area of the Rectangle is", AreaRectangle

  raw_input("Press<enter>")

    elif function==8:

  radius = input("Please enter radius ")

  AreaCircle = 3.14*(radius**2)

  print "Your function has been completed"

  print "The area of the circle is", AreaCircle

  raw_input("Press<enter>")

    elif function==9:

  pi = 3.14

  diameter = input("Please enter diameter ")

  Circumference = pi*diameter

  print "Your function has been completed"

  print "The circumference of the circle is", Circumference

  raw_input("Press<enter>")

    elif function==10: 

  Value = input("Please enter value ")

  Answer = abs(Value)

  print "Your function has been completed"

  print "The Absolute Value of", Value, "is", Answer

  raw_input("Press<enter>")

    else:

  print "You have failed."

  raw_input("Press<enter>")