akashadhikari
diff --git a/Collapse file
‎tutorial.ipynb‎
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+196-7Lines changed: 196 additions & 7 deletions b/Collapse file
‎tutorial.ipynb‎
Copy file name to clipboardExpand all lines: tutorial.ipynb
+196-7Lines changed: 196 additions & 7 deletions
@@ -23,7 +23,8 @@
     "#### 1) [Args and Kwargs](#ch1)\n",
     "#### 2) [Generators](#ch2)\n",
     "#### 3) [Map, Reduce, Filter](#ch3)\n",
-    "#### 4) [Sets](#ch4)"
+    "#### 4) [Sets](#ch4)\n",
+    "#### 5) [Decorators](#ch5)"
    ]
   },
   {
@@ -48,7 +49,7 @@
     "https://stackoverflow.com/questions/400739/what-does-asterisk-mean-in-python <br>\n",
     "https://stackoverflow.com/questions/36901/what-does-double-star-asterisk-and-star-asterisk-do-for-parameters\n",
     "\n",
-    "...\n",
+    "Check the above links.\n",
     "\n",
     "#### So, what is `*args` doing?\n",
     "`*args` allows you to pass a desired number of arguments to the function. Let's see an example."
@@ -1187,7 +1188,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Cause that's it. The filtered list only contains `[-5, -4, -3, -2, -1]`"
+    "Because that's it. The filtered list only contains `[-5, -4, -3, -2, -1]`"
    ]
   },
   {
@@ -1420,18 +1421,206 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Remove duplicates from the list."
+    "See the duplicates from the list."
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 96,
    "metadata": {},
-   "outputs": [],
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "{2, 6, 9}"
+      ]
+     },
+     "execution_count": 96,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
    "source": [
     "duplicated_list = [1,2,2,4,6,3,9,6,9,7]\n",
-    "final_list = set([x for x in duplicated_list if duplicated_list.co])"
+    "final_list = set([x for x in duplicated_list if duplicated_list.count(x)>1])\n",
+    "final_list"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "<a id=\"ch5\"></a>\n",
+    "## Chapter 5 - Decorators"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Decorators are functions which modify the functionality of another function."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 79,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "20"
+      ]
+     },
+     "execution_count": 79,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "def sum(x,y):\n",
+    "    return x+y\n",
+    "\n",
+    "def double(anything):\n",
+    "    final = anything*2\n",
+    "    return final\n",
+    "\n",
+    "double(sum(4,6)) # Take a sum of 4 and 6 and double that result."
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "In this above example, we first defined a `sum()` function that sums up two numbers.<br>\n",
+    "After that, we defined another function named `double()` that takes **function as an argument.**\n",
+    "In our case, the `double` function took the earlier result of the `sum` function and simply doubled it.  \n",
+    "Let's try another simple example."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 80,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def multiply(x,y):\n",
+    "    return x*y\n",
+    "def final():\n",
+    "    print(\"This is a multiplication operation\")\n",
+    "    print(multiply(4,4))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 81,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "This is a multiplication operation\n",
+      "16\n"
+     ]
+    }
+   ],
+   "source": [
+    "final()"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "**But where is `@`?**"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 86,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def a_new_decorator(a_func):\n",
+    "\n",
+    "    def wrapTheFunction():\n",
+    "        print(\"This is before executing a_func()\")\n",
+    "\n",
+    "        a_func()\n",
+    "\n",
+    "        print(\"Decorated!!!\")\n",
+    "\n",
+    "    return wrapTheFunction\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 89,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "This is before executing a_func()\n",
+      "I am the function which needs some decoration.\n",
+      "Decorated!!!\n"
+     ]
+    }
+   ],
+   "source": [
+    "@a_new_decorator\n",
+    "def a_function_requiring_decoration():\n",
+    "    print(\"I am the function which needs some decoration.\")\n",
+    "\n",
+    "a_function_requiring_decoration()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 90,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def doubler(a_func):\n",
+    "\n",
+    "    def wrap_it():\n",
+    "        a_func()\n",
+    "        final = a_func()*2\n",
+    "        print(final)\n",
+    "\n",
+    "    return wrap_it"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 93,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "18\n"
+     ]
+    }
+   ],
+   "source": [
+    "@doubler\n",
+    "def sum():\n",
+    "    a = 4\n",
+    "    b = 5\n",
+    "    return a+b\n",
+    "sum()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {