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add pyspark
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‎Chapter1/class.ipynb

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@@ -733,7 +733,7 @@
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"id": "2b37956a",
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"metadata": {},
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"source": [
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"### Property Decorator: A Pythonic Way to Use Getters and Setters"
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"### Ensure Data Integrity with Getters and Setters in Python"
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]
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},
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{
@@ -742,118 +742,95 @@
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"id": "1188b89a",
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"metadata": {},
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"source": [
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"To define the behaviors that are executed when a class attribute is set, use the `property` decorator.\n",
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"In Python, the property decorator controls property access and modification through getters and setters.\n",
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"\n",
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"In the code below, the getter method gets the value of the `color` attribute and the setter method restricts the `color` attribute modification to string data types only. "
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"For example, in a `BankAccount` class, without getters and setters, the balance can be directly modified, potentially leading to an invalid state."
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]
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},
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{
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"cell_type": "code",
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"execution_count": 9,
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"id": "c83e352f",
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"metadata": {
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"ExecuteTime": {
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"end_time": "2021-08-30T01:08:59.507066Z",
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"start_time": "2021-08-30T01:08:59.461065Z"
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}
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},
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"execution_count": 5,
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"id": "c3d5a814",
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"metadata": {},
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"outputs": [
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{
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"data": {
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"text/plain": [
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"'red'"
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]
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},
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"execution_count": 9,
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"metadata": {},
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"output_type": "execute_result"
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"100\n",
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"-50\n"
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]
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}
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],
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"source": [
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"class Fruit:\n",
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" def __init__(self, name: str, color: str):\n",
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" self.name = name\n",
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" self._color = color\n",
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"\n",
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" @property # getter method\n",
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" def color(self):\n",
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" return self._color\n",
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"class BankAccount:\n",
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" def __init__(self, initial_balance: float):\n",
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" self.balance = initial_balance\n",
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"\n",
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" @color.setter # setter method\n",
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" def color(self, value):\n",
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" print(\"Setting value of color...\")\n",
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" if isinstance(value, str):\n",
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" self._color = value\n",
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" else:\n",
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" raise AttributeError(\"Fruit's color must be a string.\")\n",
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"account = BankAccount(100)\n",
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"print(account.balance) \n",
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"\n",
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"\n",
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"fruit = Fruit(\"apple\", \"red\")\n",
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"fruit.color\n"
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"# Directly modifying the balance (no validation)\n",
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"account.balance = -50\n",
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"print(account.balance) "
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]
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},
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{
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"cell_type": "code",
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"execution_count": 10,
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"id": "9fa947aa",
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"metadata": {
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"ExecuteTime": {
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"end_time": "2021-08-30T01:09:03.327029Z",
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"start_time": "2021-08-30T01:09:03.301356Z"
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}
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},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Setting value of color...\n"
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]
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},
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{
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"data": {
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"text/plain": [
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"'yellow'"
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]
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},
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"execution_count": 10,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"cell_type": "markdown",
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"id": "8843dd71",
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"metadata": {},
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"source": [
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"fruit.color = \"yellow\"\n",
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"fruit.color "
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"Using getters and setters ensures the balance cannot be set to an invalid value."
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]
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},
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{
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"cell_type": "code",
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"execution_count": 11,
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"id": "1b2867b6",
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"execution_count": 6,
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"id": "ce4529d1",
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"metadata": {},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"Setting value of color...\n"
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"100\n"
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]
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},
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{
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"ename": "AttributeError",
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"evalue": "Fruit's color must be a string.",
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"ename": "ValueError",
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"evalue": "Balance cannot be negative",
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"output_type": "error",
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"traceback": [
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"\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
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"\u001b[0;31mAttributeError\u001b[0m Traceback (most recent call last)",
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"\u001b[0;32m/var/folders/5w/fg65_rp17lz39z89p0nkv8ch0000gn/T/ipykernel_78260/1033431134.py\u001b[0m in \u001b[0;36m<cell line: 1>\u001b[0;34m()\u001b[0m\n\u001b[0;32m----> 1\u001b[0;31m \u001b[0mfruit\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0mcolor\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0;36m1\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m",
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"\u001b[0;32m/var/folders/5w/fg65_rp17lz39z89p0nkv8ch0000gn/T/ipykernel_78260/3888926808.py\u001b[0m in \u001b[0;36mcolor\u001b[0;34m(self, value)\u001b[0m\n\u001b[1;32m 14\u001b[0m \u001b[0mself\u001b[0m\u001b[0;34m.\u001b[0m\u001b[0m_color\u001b[0m \u001b[0;34m=\u001b[0m \u001b[0mvalue\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m 15\u001b[0m \u001b[0;32melse\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m---> 16\u001b[0;31m \u001b[0;32mraise\u001b[0m \u001b[0mAttributeError\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m\"Fruit's color must be a string.\"\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m 17\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m 18\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n",
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"\u001b[0;31mAttributeError\u001b[0m: Fruit's color must be a string."
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"\u001b[0;31mValueError\u001b[0m Traceback (most recent call last)",
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"Cell \u001b[0;32mIn[6], line 21\u001b[0m\n\u001b[1;32m 18\u001b[0m \u001b[38;5;28mprint\u001b[39m(account\u001b[38;5;241m.\u001b[39mbalance) \n\u001b[1;32m 20\u001b[0m \u001b[38;5;66;03m# Attempting to set an invalid balance\u001b[39;00m\n\u001b[0;32m---> 21\u001b[0m \u001b[43maccount\u001b[49m\u001b[38;5;241;43m.\u001b[39;49m\u001b[43mbalance\u001b[49m \u001b[38;5;241m=\u001b[39m \u001b[38;5;241m-\u001b[39m\u001b[38;5;241m50\u001b[39m \n",
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"Cell \u001b[0;32mIn[6], line 12\u001b[0m, in \u001b[0;36mBankAccount.balance\u001b[0;34m(self, value)\u001b[0m\n\u001b[1;32m 9\u001b[0m \u001b[38;5;129m@balance\u001b[39m\u001b[38;5;241m.\u001b[39msetter\n\u001b[1;32m 10\u001b[0m \u001b[38;5;28;01mdef\u001b[39;00m \u001b[38;5;21mbalance\u001b[39m(\u001b[38;5;28mself\u001b[39m, value):\n\u001b[1;32m 11\u001b[0m \u001b[38;5;28;01mif\u001b[39;00m value \u001b[38;5;241m<\u001b[39m \u001b[38;5;241m0\u001b[39m:\n\u001b[0;32m---> 12\u001b[0m \u001b[38;5;28;01mraise\u001b[39;00m \u001b[38;5;167;01mValueError\u001b[39;00m(\u001b[38;5;124m\"\u001b[39m\u001b[38;5;124mBalance cannot be negative\u001b[39m\u001b[38;5;124m\"\u001b[39m)\n\u001b[1;32m 13\u001b[0m \u001b[38;5;28mself\u001b[39m\u001b[38;5;241m.\u001b[39m_balance \u001b[38;5;241m=\u001b[39m value\n",
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"\u001b[0;31mValueError\u001b[0m: Balance cannot be negative"
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]
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}
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],
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"source": [
856-
"fruit.color = 1"
813+
"class BankAccount:\n",
814+
" def __init__(self, initial_balance: float):\n",
815+
" self._balance = initial_balance\n",
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"\n",
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" @property\n",
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" def balance(self):\n",
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" return self._balance\n",
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"\n",
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" @balance.setter\n",
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" def balance(self, value):\n",
823+
" if value < 0:\n",
824+
" raise ValueError(\"Balance cannot be negative\")\n",
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" self._balance = value\n",
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"\n",
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"\n",
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"# Example usage\n",
829+
"account = BankAccount(100)\n",
830+
"print(account.balance) \n",
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"\n",
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"# Attempting to set an invalid balance\n",
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"account.balance = -50 "
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]
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},
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{

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