Fixes OpenGuide#59 : Add Python Program to print factorial of an entered number

Used python lambda function to recursively compute factorial.

Author: janakrajchadha

Factorial/recursive_factorial_using_lambda.py

@@ -0,0 +1,8 @@
+#Python program to find factorial of a number recursively
+#This makes use of 'lambda' or anonymous functions
+
+factorial = lambda x: x and x * factorial(x - 1) if x > 0 else 1
+
+n = int(input('Enter a number:'))
+
+print(('Factorial of '+ str(n) + ' is ' + str(factorial(n))) if not n < 0 else 'Enter a valid input')