Generators_python_Monday.ipynb

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    "#why generators\n",
    "#Lazy Coding\n",
    "#memory profiler\n",
    "#generators variable assignments are not lost even after function exits.\n",
    "\n",
    "from memory_profiler import profile\n",
    "@profile\n",
    "def my_func():\n",
    "    mylist=[1,2,3,4,5,6,7,8,9,9,10]\n",
    "    for values in mylist:\n",
    "        print values\n",
    "my_func()\n",
    "\n",
    "@profile\n",
    "def file_reader(file_path,lines):\n",
    "    fp=open(filepath,'r')\n",
    "    line_count=0\n",
    "    while line_count<=lines:\n",
    "        yield fp.readline()\n",
    "    line_count=+1"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "#Generators\n",
    "\n",
    "# Generator function for the cube of numbers (power of 3)\n",
    "def gencubes(n):\n",
    "    for num in range(n):\n",
    "        yield num**3\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "\n",
    "for x in gencubes(10):\n",
    "    print(x)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "def simple_gen():\n",
    "    for x in range(3):\n",
    "        yield x\n",
    "\n",
    "# Assign simple_gen \n",
    "g = simple_gen()\n",
    "\n",
    "print(next(g))\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "s = 'hello'\n",
    "\n",
    "#Iterate over string\n",
    "for let in s:\n",
    "    print(let)\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "s_iter = iter(s)\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "next(s_iter)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [],
   "source": [
    "evens=(x for x in range(100) if x%2==0)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "6\n"
     ]
    }
   ],
   "source": [
    "print next(evens)"
   ]
  },
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   "outputs": [],
   "source": []
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   "cell_type": "code",
   "execution_count": 2,
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   "outputs": [
    {
     "ename": "AttributeError",
     "evalue": "'generator' object has no attribute '__next__'",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mAttributeError\u001b[0m                            Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-2-83c634a5d63a>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m()\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mevens\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0m__next__\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[0;31mAttributeError\u001b[0m: 'generator' object has no attribute '__next__'"
     ]
    }
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   "source": []
  },
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