pm21-dragon/exercises/release/exercise-07/1__classes.ipynb

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    "# Classes in Python\n",
    "\n",
    "First, let's consider some data in a plain Python dictionary:"
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    "car1 = {\n",
    "    'name': 'Fer',\n",
    "    'worth': 60000,\n",
    "    'type_': 'convertible',\n",
    "    'color': 'red'\n",
    "}\n",
    "car2 = {\n",
    "    'name': 'Jump',\n",
    "    'worth': 10000,\n",
    "    'type_': 'van',\n",
    "    'color': 'blue'\n",
    "}"
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    "car1['name']"
   ]
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   "source": [
    "Now, let's make a Python class which will hold this same kind of data:"
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    "class Car:\n",
    "    def __init__(self,name,worth,type_,color):\n",
    "        self.name = name\n",
    "        self.worth = worth\n",
    "        self.type_ = type_\n",
    "        self.color = color\n",
    "    def print_car(self):\n",
    "        print(\"%s is worth %d and is a %s %s.\"%(self.name, self.worth, self.color, self.type_))"
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    "car1 = Car(\"Fer\",60000,\"convertible\",\"red\")"
   ]
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   "source": [
    "## Takeaway message\n",
    "\n",
    "- The data in an instances of a class are conceptually very similar to python dicts with a few special features. One of these special features is methods. Another is that you access instance variables with with the `x_instance.name` syntax instead of `x_dict['name']` syntax."
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    "## Q1 creating an instance of a class\n",
    "\n",
    "We have a class defined for vehicles. Create two new vehicles (\"instances of the class\") with the variable names `car1` and `car2`. Set car1 to be a red convertible worth EUR 60,000.00 with a name of Fer, and car2 to be a blue van named Jump worth EUR 10,000.00."
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    "class Vehicle:\n",
    "    def __init__(self, color, worth, name):    \n",
    "        self.color = color\n",
    "        self.worth = worth\n",
    "        self.name = name\n",
    "    def get_description(self):\n",
    "        return 'name: {}, worth: {}, color: {}'.format(self.name, self.worth, self.color)"
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    "# YOUR CODE HERE\n",
    "raise NotImplementedError()"
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    "# This checks if your code works. Do not change it. It should run without error.\n",
    "assert( car1.get_description()==\"name: Fer, worth: 60000, color: red\" )\n",
    "assert( car2.get_description()==\"name: Jump, worth: 10000, color: blue\" )"
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    "## Q2 creating a class\n",
    "\n",
    "Create a class called `Pet`. The `__init__` function should take 3 arguments: `self`, `name`, and `sound`. The `name`, and `sound` arguments should be assigned to the instance variables `self.name` and `self.sound`."
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    "# YOUR CODE HERE\n",
    "raise NotImplementedError()"
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    "# This checks if your code works. Do not change it. It should run without error.\n",
    "my_pet = Pet('Bob', 'talk')\n",
    "assert(my_pet.name=='Bob')\n",
    "assert(my_pet.sound=='talk')"
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    "## Q3 writing a method\n",
    "\n",
    "Now, create a new class called `NoisyPet`. The `__init__` function should be like in `Pet`. (It takes 3 arguments: `self`, `name`, and `sound`. The `name`, and `sound` arguments should be assigned to the instance variables `self.name` and `self.sound`.)\n",
    "\n",
    "`NoisyPet` should have an additional method called `make_noise` which takes zero additional arguments (of course `self` is required). The `make_noise` for a name of `\"cricket\"` and sound of `\"chirp\"`, this method should return a string like `\"My pet cricket makes a noise like chirp\"`. Thus, you will need to return a string you have created using string formatting."
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    "# This checks if your code works. Do not change it. It should run without error.\n",
    "assert(NoisyPet(\"cricket\", \"chirp\").make_noise()==\"My pet cricket makes a noise like chirp\")"
   ]
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   "source": [
    "## Q4 using instances 1\n",
    "\n",
    "Now create a list named `my_pets` with 5 instances of the NoisyPet class given the following names and noises.\n",
    "\n",
    "| name | noise |\n",
    "| --- | --- |\n",
    "| Fido | slobber |\n",
    "| Mr. Skinny Legs | (silent) |\n",
    "| cricket | chirp |\n",
    "| Adelheid | cackle |\n",
    "| Bello | bark |"
   ]
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    "# YOUR CODE HERE\n",
    "raise NotImplementedError()"
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    "# This checks if your code works. Do not change it. It should run without error.\n",
    "assert(type(my_pets)==list)\n",
    "assert(len(my_pets)==5)\n",
    "for my_pet in my_pets:\n",
    "    assert(isinstance(my_pet,NoisyPet))\n",
    "    my_pet.make_noise()"
   ]
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   "source": [
    "## Q5 using instances 2\n",
    "\n",
    "Now create a function list named `get_pet_name_length` which takes a single argument, which is an instance of the NoisyPet class. It should return the number of letters in the pet's name."
   ]
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    "# YOUR CODE HERE\n",
    "raise NotImplementedError()"
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    "# This checks if your code works. Do not change it. It should run without error.\n",
    "assert(get_pet_name_length(NoisyPet(\"Bello\", \"bark\"))==5)\n",
    "assert(get_pet_name_length(NoisyPet(\"cricket\", \"chirp\"))==7)"
   ]
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