rpn yo

python/10-reverse-polish-notation/README.md

@@ -6,18 +6,18 @@ You've never done it until you've done it reverse polish.
 I don't know what that means, but check this out on [reverse polish notation](http://en.wikipedia.org/wiki/Reverse_Polish_notation).
 
 Reverse polish notation is a mathematical notation in which every operator follows all of its operands. For example:
-
-	3 4 + >>> 7  
-	4 2 / >>> 2  
-	10 7 2 - * 5 / >>> 10
-
+```
+3 4 + = 7  
+4 2 / = 2  
+10 7 2 - * 5 / = 10
+```
 Write a program that accepts a RPN equation as a command line argument, such that you would execute your program:
-
-		python3 rpn_calc.py 10 9 - 5 +
-
+```
+python3 rpn_calc.py 10 9 - 5 +
+```
 Which would then return you 6, the result of that equation.
 
-###ARGV
+#### ARGV
 
 To run the program like this you need to import the sys library and access sys.argv.
 
@@ -25,15 +25,17 @@ ARGV gives us the arguments used to launch the program as an array. The first po
 
 Read about sys.argv [here](http://www.pythonforbeginners.com/system/python-sys-argv)
 
-Sandbox with this so you know what you are getting as an input.
+Sandbox with it, so you know what you are getting as an input.
 
 Here's a nice hint - we can "slice" arrays in Python like in JS just by doing:
+```
+>>> array = ['hi', 'wut', 'm8', 'lol', 'doge']
+>>> array[2:4]
+['m8', 'lol']
+```
 
-		array = ['hi', 'wut', 'm8', 'lol', 'doge']
-		array[2:4] ### returns ['m8', 'lol']
-
-###Testing
+#### Testing
 
 Write some assert statements after you've solved the challenge.
 
-NOTE: You might need to escape the multiplication operator * when you pass it in. 
+**NOTE**: You might need to escape the multiplication operator * when you pass it in. You can escape things by adding a backslash (\) in front of it.