Object_Oriented_Python_1_OOP.ipynb

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   "source": [
    "# Part 1 - Object-oriented programming"
   ]
  },
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Plain old procedures"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "data = (13, 63, 5, 378, 58, 40)"
   ]
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  {
   "cell_type": "code",
   "execution_count": null,
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   "outputs": [],
   "source": [
    "def avg(d):\n",
    "    return sum(d)/len(d)"
   ]
  },
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   "cell_type": "code",
   "execution_count": null,
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   "outputs": [],
   "source": [
    "avg(data)"
   ]
  },
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Procedures can modify data"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "lift1 = [1, 'closed']  # floor, status\n",
    "lift2 = [2, 'open']"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "def print_lift(lift):\n",
    "    print(\"The lift is at floor {}, doors are {}\".format(lift[0], lift[1]))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "print_lift(lift1)"
   ]
  },
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   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "def open_lift(lift):\n",
    "    lift[1] = 'open'"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "open_lift(lift1)"
   ]
  },
  {
   "cell_type": "code",
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   "source": [
    "print_lift(lift1)"
   ]
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Things can get complicated"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "security_lift1 = [1, 'closed', 'unlocked']"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "def open_security_lift(lift):\n",
    "    if lift[2] == 'unlocked':\n",
    "        lift[1] = 'open'"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "open_security_lift(security_lift1)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "print_lift(security_lift1)"
   ]
  },
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Type: behavioural meaning"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<img src=\"images/duck.jpg\" align=\"center\" width=\"800\"/>"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Type: structural meaning"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<img src=\"images/robot.jpg\" align=\"center\" width=\"800\"/>"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Main concept\n",
    "\n",
    "**The behavioural meaning is important**\n",
    "\n",
    "> Duck typing: make it behave like a duck\n",
    "(Alex Martelli in 2000 on comp.lang.python)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Duck, typing"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<img src=\"images/duck_typing.jpg\" align=\"center\" width=\"800\"/>"
   ]
  }
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