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python/11-factorial/README.md

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+Factorial!
+==========
+
+Get the factorial of a given number. Using sys.argv, pass in a number and return it's factorial.
+
+To calculate the factorial of 5, for example, the equation is:
+
+		5 * 4 * 3 * 2 * 1 ###120
+
+###Iterative
+
+Write the equation iteratively, using a for or while loop. How to use loops in Python is well documented [here](https://docs.python.org/3.4/tutorial/controlflow.html)
+
+###Recursive
+
+Now write this function recursively. If you run into difficulty, think about how your stack will develop as your function recurses and remember to define your base case.
+
+Write assert statements to test your code in both cases.
+
+[Wikipedia on Factorials](http://en.wikipedia.org/wiki/Factorial)