@@ -362,7 +362,7 @@
    "source": [
     "## Generators\n",
     "A generator is a special iterable function that does not terminate but wait for you to request the next output.\n",
-    "For this it uses the `yield` keyword that keeps the namespace inside the function alive until a `return` keyword is reached.\n",
+    "For this it uses the `yield` keyword that keeps the namespace inside the function alive until a `return` keyword is reached or there's no more code to run.\n",
     "To ask a generator for its next output you use the `next()` function."
    ]
   },
@@ -1264,7 +1264,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.6"
+   "version": "3.7.5"
   },
   "latex_envs": {
    "LaTeX_envs_menu_present": true,
 
@@ -402,9 +402,9 @@
     "    with open(filename, 'w') as f:\n",
     "        print('ready to write')\n",
     "        while True:\n",
-    "            str = yield\n",
-    "            f.write(str)\n",
-    "            print(f'just wrote \"{str}\" to file \"{filename}\"')"
+    "            string = yield\n",
+    "            f.write(string)\n",
+    "            print(f'just wrote \"{string}\" to file \"{filename}\"')"
    ]
   },
   {
@@ -779,7 +779,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.6"
+   "version": "3.7.5"
   },
   "latex_envs": {
    "LaTeX_envs_menu_present": true,