Added factorial implementation (recursive)

Author: OmkarPathak

pygorithm/math/factorial.py

@@ -0,0 +1,19 @@
+"""
+Author: OMKAR PATHAK
+Created On: 22 August 2017
+"""
+
+def factorial(number):
+    ''' This function calculates the factorial of a number '''
+    if not isinstance(number, int):
+        raise Exception('Enter an integer number to find the factorial')
+    if number == 1 or number == 0:
+        return 1
+    else:
+        return number * factorial(number - 1)
+
+def get_code():
+    """
+    returns the code for the factorial function
+    """
+    return inspect.getsource(factorial)