1.

Finding the factorial of a number

# to find the factorial of a number. program loops, asking the user a
# number, which it uses to find the factorial. Enter -1 to quit the loop
# and exit the program

myfactorial = 0 #final factorial value
what_factorial = 0 #the factorial number the user wants to find

print "Finding e...."

def myfact (n) :
   if (n == 1):
      return 1
   f_value = n * myfact(n-1)
   return f_value

while (1) :
  what_factorial = int(raw_input("Factorial : [enter -1 to quit] "))
  if (what_factorial == -1) :
    break;
  else :
    myfactorial = myfact(what_factorial)
    print "e = ", myfactorial

2.

Generate the Fibonacci series

def fibonacci(n):

  if (n < 0) :
    print "Cannot find the fibonacci of a negative number..."

  if (n ==0) or (n == 1) : #base case
    return n
  else :

    #two recursive calls
     return fibonacci(n-1) + fibonacci(n-2)

number = int(raw_input("Enter an integer to generate the Fibonacci series :"))
result = fibonacci(number)
print "Fibonacci (%d) = %d" % (number, result)