Updated Nim for Python Programmers (markdown)

Nim-for-Python-Programmers.md

@@ -148,7 +148,14 @@ The Nim set type is faster and memory-efficient.
 
 ### Dictionaries
 
-Use [Tables](http://nim-lang.org/tables.html)
+Use [Tables](http://nim-lang.org/tables.html) for Python dicts,
+OrderedTable for Python ordered dicts, and CountTable for Python's Counter.
+
+``` Nim
+var a = {"hi": 1, "there": 2}.toTable
+echo a["hi"], " ", a.len
+assert a.hasKey("hi")
+```
 
 ### ABC