Takes user input and calculates the factorial

Author: JenGoodridge

Patterns/factorial_calculation.py

@@ -0,0 +1,8 @@
+# recursively finds the factorial of a number
+def factorial(number):
+    if number == 0:
+        return 1
+    else:
+        return factorial(number - 1) * number
+
+print(factorial(20))