Updated Nim for Python Programmers (markdown)

Nim-for-Python-Programmers.md

@@ -128,6 +128,17 @@ So, when using inheritance, be sure to inherit using refs, unless you know what
 
 ## From Python to Nim
 
+### Python strings
+
+Use double quotes: "foo" or """foo""", not 'foo'
+
+Strings are always unicode. Remember to use runes() to iterate over unicode characters instead of bytes.
+
+``` Nim
+var a = "hello"
+echo a[0..1]  # returns "he": ranges are inclusive!
+```
+
 ### Python tuples
 
 Nim Tuples are close to Python nametuples, see [manual](http://nim-lang.org/manual.html#tuples-and-object-types).