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‎04-OOP-Inheritance.ipynb

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"metadata": {}
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},
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{
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"cell_type": "code",
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"execution_count": 2,
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"cell_type": "markdown",
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"source": [
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"## `Developer` class"
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],
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"outputs": [],
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"metadata": {}
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},
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{
@@ -162,45 +160,372 @@
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"source": [],
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"outputs": [],
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"execution_count": 7,
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"source": [
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"# method resolution order\n",
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"help(Developer)"
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],
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"outputs": [
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{
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"output_type": "stream",
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"name": "stdout",
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"text": [
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"Help on class Developer in module __main__:\n",
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"\n",
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"class Developer(Employee)\n",
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" | Developer(name, surname)\n",
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" | \n",
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" | Method resolution order:\n",
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" | Developer\n",
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" | Employee\n",
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" | builtins.object\n",
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" | \n",
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" | Methods inherited from Employee:\n",
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" | \n",
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" | __init__(self, name, surname)\n",
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" | Initialize self. See help(type(self)) for accurate signature.\n",
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" | \n",
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" | add_daily_hours(self, daily_hours)\n",
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" | \n",
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" | fullname(self)\n",
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" | \n",
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" | salary(self)\n",
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" | \n",
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" | ----------------------------------------------------------------------\n",
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" | Class methods inherited from Employee:\n",
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" | \n",
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" | from_string(name_str) from builtins.type\n",
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" | \n",
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" | set_hourly_wage(hourly_wage) from builtins.type\n",
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" | \n",
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" | ----------------------------------------------------------------------\n",
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" | Static methods inherited from Employee:\n",
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" | \n",
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" | is_workday(day)\n",
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" | \n",
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" | ----------------------------------------------------------------------\n",
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" | Data descriptors inherited from Employee:\n",
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" | \n",
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" | __dict__\n",
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" | dictionary for instance variables (if defined)\n",
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" | \n",
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" | __weakref__\n",
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" | list of weak references to the object (if defined)\n",
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" | \n",
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" | ----------------------------------------------------------------------\n",
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" | Data and other attributes inherited from Employee:\n",
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" | \n",
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" | count = 2\n",
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" | \n",
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" | hourly_wage = 20\n",
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"\n"
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]
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}
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],
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"metadata": {}
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},
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{
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"cell_type": "markdown",
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"source": [
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"### Customizing the sublass"
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],
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"metadata": {}
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"source": [],
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"execution_count": 8,
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"source": [
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"class Developer(Employee):\n",
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" hourly_wage = 30"
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],
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"outputs": [],
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"metadata": {}
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"source": [],
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"execution_count": 9,
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"source": [
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"developer1 = Developer(\"John\", \"Smith\")\n",
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"developer1.add_daily_hours(8)\n",
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"developer1.salary()"
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],
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"outputs": [
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{
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"output_type": "execute_result",
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"data": {
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"text/plain": [
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"240"
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]
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},
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"metadata": {},
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"execution_count": 9
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}
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],
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"metadata": {}
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},
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{
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"cell_type": "markdown",
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"source": [
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"### Adding attributes to the subclass"
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],
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"metadata": {}
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},
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{
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"cell_type": "code",
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"execution_count": 21,
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"source": [
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"class Developer(Employee):\n",
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" hourly_wage = 30\n",
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"\n",
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" def __init__(self, name, surname, programming_language):\n",
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" super().__init__(name, surname) # using super class constructor\n",
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" self.programming_languages = programming_language"
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],
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"outputs": [],
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"metadata": {}
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"source": [],
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"execution_count": 20,
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"source": [
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"# create objects\n",
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"developer1 = Developer(\"John\", \"Smith\", \"Python\")\n",
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"developer2 = Developer(\"David\", \"Jhonson\", \"Java\")\n",
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"\n",
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"# use objects\n",
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"print(developer1.email)\n",
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"print(developer2.email)\n"
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],
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"outputs": [
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{
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"output_type": "stream",
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"name": "stdout",
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"text": [
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"{'name': 'John', 'surname': 'Smith', 'email': '[email protected]', 'hours': 0, 'id': '00014'}\n",
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"{'name': 'David', 'surname': 'Jhonson', 'email': '[email protected]', 'hours': 0, 'id': '00015'}\n",
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"[email protected]\n",
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"[email protected]\n"
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]
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}
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],
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"metadata": {}
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},
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{
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"cell_type": "markdown",
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"source": [
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"## `Manager` class"
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],
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"metadata": {}
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},
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{
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"cell_type": "code",
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"execution_count": 22,
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"source": [
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"class Manager(Employee):\n",
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" hourly_wage = 50\n",
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"\n",
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" def __init__(self, name, surname, employees=None):\n",
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" super().__init__(name, surname)\n",
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"\n",
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" self.employees = [] if employees is None else employees"
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],
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"outputs": [],
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"metadata": {}
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},
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{
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"cell_type": "markdown",
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"source": [
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"### Good practice\n",
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"- Don't use mutable objects like `list` and `dict` as default values.\n",
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"- That's why here we have used `None` instead of an empty list (`[]`)."
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],
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"metadata": {}
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"source": [],
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"execution_count": 28,
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"source": [
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"class Manager(Employee):\n",
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" hourly_wage = 50\n",
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"\n",
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" def __init__(self, name, surname, employees=None):\n",
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" super().__init__(name, surname)\n",
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"\n",
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" self.employees = [] if employees is None else employees\n",
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"\n",
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" def add_employee(self, employee):\n",
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" if employee not in self.employees:\n",
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" self.employees.append(employee)\n",
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"\n",
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" def remove_employee(self, employee):\n",
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" if employee in self.employees:\n",
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" self.employees.remove(employee)\n",
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"\n",
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" def print_employees(self):\n",
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" print(f\"{self.fullname()} manages ({', '.join([e.fullname() for e in self.employees])})\")\n"
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],
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"outputs": [],
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"metadata": {}
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},
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{
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"cell_type": "code",
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"execution_count": null,
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"source": [],
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"execution_count": 31,
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"source": [
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"# create object\n",
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"manager1 = Manager(\"Mat\", \"Anderson\", [developer1])\n",
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"\n",
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"# use object\n",
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"manager1.add_employee(developer2)\n",
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"\n",
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"print(manager1.email)\n",
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"manager1.print_employees()"
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],
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"outputs": [
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{
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"output_type": "stream",
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"name": "stdout",
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"text": [
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"[email protected]\n",
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"Mat Anderson manages (John Smith, David Jhonson)\n"
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]
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}
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],
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"metadata": {}
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},
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{
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"cell_type": "code",
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"execution_count": 32,
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"source": [
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"manager1.remove_employee(developer1)\n",
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"manager1.print_employees()"
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],
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"outputs": [
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{
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"output_type": "stream",
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"name": "stdout",
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"text": [
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"Mat Anderson manages (David Jhonson)\n"
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]
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}
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],
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"metadata": {}
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},
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{
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"cell_type": "markdown",
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"source": [
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"## `isinstance()` and `issubclass()`\n",
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"- `isinstance()` will tell us wether or not an object is instance of a class.\n",
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"- `issubclass()` will tell us wether or not an object is subclass of another class."
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],
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"metadata": {}
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},
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{
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"cell_type": "code",
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"execution_count": 34,
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"source": [
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"print(isinstance(manager1, Manager))\n",
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"print(isinstance(manager1, Employee))\n",
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"print(isinstance(manager1, Developer))"
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],
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"outputs": [
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{
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"output_type": "stream",
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"name": "stdout",
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"text": [
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"True\n",
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"True\n",
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"False\n"
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]
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}
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],
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"metadata": {}
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},
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{
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"cell_type": "code",
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"execution_count": 37,
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"source": [
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"print(issubclass(Manager, Employee))\n",
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"print(issubclass(Developer, Employee))"
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],
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"outputs": [
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{
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"output_type": "stream",
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"name": "stdout",
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"text": [
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"True\n",
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"True\n"
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]
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}
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],
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"metadata": {}
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},
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{
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"cell_type": "code",
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"execution_count": 42,
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"source": [
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"class Manager(Employee):\n",
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" hourly_wage = 50\n",
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"\n",
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" def __init__(self, name, surname, employees=None):\n",
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" super().__init__(name, surname)\n",
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"\n",
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" if employees is None:\n",
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" self.employees = [] \n",
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" else:\n",
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" if isinstance(employees, list):\n",
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" self.employees = employees\n",
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" elif isinstance(employees, Employee):\n",
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" self.employees = [employees]\n",
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" else:\n",
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" self.employees = []\n",
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" print(\"Error! You can only use Employee objects!\")\n",
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"\n",
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" def add_employee(self, employee):\n",
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" if employee not in self.employees:\n",
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" self.employees.append(employee)\n",
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"\n",
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" def remove_employee(self, employee):\n",
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" if employee in self.employees:\n",
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" self.employees.remove(employee)\n",
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"\n",
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" def print_employees(self):\n",
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" print(f\"{self.fullname()} manages ({', '.join([e.fullname() for e in self.employees])})\")\n"
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],
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"outputs": [],
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"metadata": {}
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},
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{
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"cell_type": "code",
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"execution_count": 44,
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"source": [
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"# create object\n",
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"manager1 = Manager(\"Mat\", \"Anderson\", developer1)\n",
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"\n",
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"# use object\n",
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"manager1.add_employee(developer2)\n",
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"\n",
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"print(manager1.email)\n",
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"manager1.print_employees()"
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],
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"outputs": [
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{
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"output_type": "stream",
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"name": "stdout",
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"text": [
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"[email protected]\n",
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"Mat Anderson manages (John Smith, David Jhonson)\n"
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]
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}
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],
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"metadata": {}
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},
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{
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"cell_type": "markdown",
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"source": [
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"## Next\n",
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"- Using Python special methods and overloading"
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],
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"metadata": {}
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}
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],
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"metadata": {

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