fixed for-loop example

tutorials/scope_resolution_legb_rule.ipynb

@@ -593,7 +593,8 @@
      "cell_type": "markdown",
      "metadata": {},
      "source": [
-      "Similar to the concept of the `global` keyword, which we have seen in the section above, we can use the keyword `nonlocal` inside the inner function to explicitely access a variable from the outer (enclosed) scope in order to modify its value:"
+      "Similar to the concept of the `global` keyword, which we have seen in the section above, we can use the keyword `nonlocal` inside the inner function to explicitely access a variable from the outer (enclosed) scope in order to modify its value.  \n",
+      "Note that the `nonlocal` keyword was added in Python 3.x and is not implemented in Python 2.x (yet)."
      ]
     },
     {
@@ -1045,12 +1046,13 @@
      ]
     },
     {
-     "cell_type": "code",
+     "cell_type": "markdown",
-     "collapsed": false,
-     "input": [],
-     "language": "python",
      "metadata": {},
-     "outputs": []
+     "source": [
+      "This goes back to a change that was made in Python 3.x and is described in [What\u2019s New In Python 3.0](https://docs.python.org/3/whatsnew/3.0.html) as follows:\n",
+      "\n",
+      "\"List comprehensions no longer support the syntactic form `[... for var in item1, item2, ...]`. Use `[... for var in (item1, item2, ...)]` instead. Also note that list comprehensions have different semantics: they are closer to syntactic sugar for a generator expression inside a `list()` constructor, and in particular the loop control variables are no longer leaked into the surrounding scope.\""
+     ]
     }
    ],
    "metadata": {}