Added info about Nonlocal NameSpace/Variable PyBasics-1.ipynb

Author: imfaisalmalik

basic/PyBasics-1.ipynb

@@ -301,7 +301,7 @@
     "<!-- using Table Style for this -->\n",
     "| *1. Arithmetic operators* | \n",
     "|:--:| \n",
-    "| ![Arithmetic](imgs/arithmetic_ops.PNG)|\n",
+    "| ![Arithmetic](imgs/arithmetic_ops.PNG) |\n",
     "\n",
     "\n",
     "| *2. Assignment Operators* | \n",
@@ -415,10 +415,16 @@
     "- These different namespaces are isolated. Hence, the same name that may exist in different modules does not collide.\n",
     "- Modules can have various functions and classes. \n",
     "\n",
-    "`Local namespace`\n",
+    "**`Local namespace`**\n",
     "- A local namespace is created when a function is called, which has all the names defined in it.\n",
     "- Similar is the case with class.\n",
     "\n",
+    "**`Python Nonlocal Variables`**\n",
+    "\n",
+    "- In Python, nonlocal variables are used in nested functions whose local scope is not defined. \n",
+    "  - This means that the variable can be neither in the local nor the global scope.\n",
+    "- We use the nonlocal keyword to create nonlocal variables.\n",
+    "\n",
     "## <a id='toc6_1_'></a>[Python Variable Scope << Namespaces >>](#toc0_)\n",
     "**When a reference is made inside a function, the name is searched in the local namespace, then in the global namespace and finally in the built-in namespace.**"
    ]
@@ -463,6 +469,41 @@
     "outer_function()"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "inner: nonlocal\n",
+      "outer: nonlocal\n"
+     ]
+    }
+   ],
+   "source": [
+    "##################### Nonlocal NameSpace #######\n",
+    "# outside function \n",
+    "def outer():\n",
+    "    message = 'local'\n",
+    "\n",
+    "    # nested function  \n",
+    "    def inner():\n",
+    "\n",
+    "        # declare nonlocal variable\n",
+    "        nonlocal message\n",
+    "\n",
+    "        message = 'nonlocal'\n",
+    "        print(\"inner:\", message)\n",
+    "\n",
+    "    inner()\n",
+    "    print(\"outer:\", message)\n",
+    "\n",
+    "outer()"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},