feat: 新增技能扩展N5一章相关示例源码
This commit is contained in:
100gle
572
code/newsletter/N5/class-and-methods.ipynb
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572
code/newsletter/N5/class-and-methods.ipynb
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{
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"cells": [
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"# Decorator"
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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": 7,
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"metadata": {},
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"outputs": [],
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"source": [
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"import re\n",
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"from urllib.parse import parse_qs"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Property"
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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": 8,
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"metadata": {},
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"outputs": [],
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"source": [
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"class Connector:\n",
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" def __init__(self, dialect: str, dsn: str) -> None:\n",
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" self.dialect = dialect\n",
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" self.dsn = dsn\n",
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"\n",
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" def __repr__(self) -> str:\n",
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" return f'{self.__class__.__name__}<dialect: {self.dialect}, dsn: {self.dsn}>'\n",
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"\n",
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" def __enter__(self):\n",
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" print(f\"Connecting {self.dialect} database...\")\n",
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" return self.connect()\n",
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"\n",
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" def __exit__(self, *exc):\n",
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" self.close()\n",
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"\n",
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" def connect(self):\n",
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" return self\n",
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"\n",
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" def close(self):\n",
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" print(f\"Closing database connection...\")\n",
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"\n",
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" def query(self, sql: str):\n",
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" print(f\"Executing sql: {sql}\")\n"
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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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"metadata": {},
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"outputs": [],
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"source": [
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"\n",
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"class Database:\n",
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"\n",
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" DSNPattern = re.compile(\n",
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" \"\"\"\n",
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" (?:\n",
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" (?P<dialect>.*?):// # dialect: mysql, sqlite, postgresql, etc.\n",
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" (?P<username>.*?): # username\n",
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" (?P<password>.*?)@ # password\n",
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" (?P<host>.*?): # host\n",
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" (?P<port>\\d+) # port\n",
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" )\n",
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" \"\"\",\n",
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" re.S | re.X,\n",
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" )\n",
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"\n",
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" def __init__(self, dsn):\n",
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" self.dsn = dsn\n",
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" self._conn = None\n",
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"\n",
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" @property\n",
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" def conn(self):\n",
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" dialect = self._parse_dsn(self.dsn).get(\"dialect\")\n",
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" self._conn = Connector(dialect=dialect, dsn=self.dsn)\n",
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" return self._conn\n",
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"\n",
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" @conn.setter\n",
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" def conn(self, connector):\n",
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" if not isinstance(connector, Connector):\n",
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" raise TypeError(\n",
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" f\"Can't set an invalid connector to Database `conn` property.\"\n",
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" )\n",
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" self._conn = connector\n",
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"\n",
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" def _parse_dsn(self, dsn: str):\n",
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" return self.DSNPattern.search(dsn).groupdict()\n"
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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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"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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"Connector<dialect: mysql, dsn: mysql://user:password@127.0.0.1:3306>\n"
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]
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}
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],
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"source": [
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"dsn = \"mysql://user:password@127.0.0.1:3306\"\n",
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"database = Database(dsn=dsn)\n",
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"print(database.conn)\n",
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"\n",
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"# # raise error when value isn't Connector object\n",
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"# database.conn = \"foo\" \n"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Classmethod"
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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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"metadata": {},
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"outputs": [],
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"source": [
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"class Dialect:\n",
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" @classmethod\n",
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" def parse_options(cls, qs: str):\n",
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" raise NotImplementedError"
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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": 12,
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"metadata": {},
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"outputs": [],
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"source": [
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"class PostgreSQL(Dialect):\n",
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" @classmethod\n",
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" def parse_options(cls, qs: str):\n",
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" features = [\"client_encoding\"]\n",
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" params = parse_qs(qs)\n",
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" options = {}\n",
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" for key in params.keys():\n",
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" if key in features:\n",
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" options[key] = params[key]\n",
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"\n",
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" return options"
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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": 13,
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"metadata": {},
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"outputs": [],
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"source": [
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"class MySQL(Dialect):\n",
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" @classmethod\n",
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" def parse_options(cls, qs: str):\n",
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" features = [\"charset\", \"timezone\"]\n",
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" params = parse_qs(qs)\n",
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" options = {}\n",
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" for key in params.keys():\n",
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" if key in features:\n",
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" options[key] = params[key]\n",
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"\n",
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" return options"
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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": 14,
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"metadata": {},
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"outputs": [],
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"source": [
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"\n",
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"class Connector:\n",
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" def __init__(self, dialect: str, dsn: str, options=None) -> None:\n",
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" self.dialect = dialect\n",
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" self.dsn = dsn\n",
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" self.options = options or None\n",
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"\n",
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" def __repr__(self) -> str:\n",
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" if not self.options:\n",
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" return (\n",
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" f'{self.__class__.__name__}<dialect: {self.dialect}, dsn: {self.dsn}>'\n",
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" )\n",
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" return f'{self.__class__.__name__}<dialect: {self.dialect}, dsn: {self.dsn}, options: {self.options}>'\n",
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"\n",
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" def __enter__(self):\n",
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" print(f\"Connecting {self.dialect} database...\")\n",
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" return self.connect()\n",
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"\n",
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" def __exit__(self, *exc):\n",
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" self.close()\n",
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"\n",
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" def connect(self):\n",
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" return self\n",
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"\n",
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" def close(self):\n",
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" print(f\"Closing database connection...\")\n",
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"\n",
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" def query(self, sql: str):\n",
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" print(f\"Executing sql: {sql}\")\n"
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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": 15,
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"metadata": {},
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"outputs": [],
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"source": [
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"\n",
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"class Database:\n",
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"\n",
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" DSNPattern = re.compile(\n",
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" \"\"\"\n",
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" (?:\n",
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" (?P<dialect>.*?) # dialect: mysql, sqlite, postgresql, etc.\n",
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" ://(?P<username>.*?) # username\n",
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" :(?P<password>.*?) # password\n",
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" @(?P<host>.*?) # host\n",
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" :(?P<port>\\d+) # port\n",
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" [?]*(?P<options>.*) # database options\n",
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" )\n",
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" \"\"\",\n",
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" re.S | re.X,\n",
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" )\n",
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"\n",
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" def __init__(self, dsn: str, dialect: Dialect = None):\n",
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" self.dsn = dsn\n",
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" self.dialect = dialect\n",
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"\n",
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" @property\n",
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" def conn(self):\n",
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" parts = self._parse_dsn(self.dsn)\n",
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" dialect = parts.get(\"dialect\")\n",
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" qs = parts.get(\"options\")\n",
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" options = None\n",
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"\n",
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" if qs and self.dialect:\n",
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" options = self.dialect.parse_options(qs)\n",
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"\n",
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" self._conn = Connector(dialect=dialect, dsn=self.dsn, options=options)\n",
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" return self._conn\n",
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"\n",
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" @conn.setter\n",
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" def conn(self, connector):\n",
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" if not isinstance(connector, Connector):\n",
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" raise TypeError(\n",
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" f\"Can't set an invalid connector to Database `conn` property.\"\n",
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" )\n",
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" self._conn = connector\n",
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"\n",
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" def _parse_dsn(cls, dsn: str):\n",
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" return cls.DSNPattern.search(dsn).groupdict()\n",
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"\n"
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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": 16,
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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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"Connector<dialect: mysql, dsn: mysql://user:password@127.0.0.1:3306>\n"
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]
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}
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],
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"source": [
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"dsn = \"mysql://user:password@127.0.0.1:3306\"\n",
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"database = Database(dsn=dsn, dialect=PostgreSQL)\n",
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"print(database.conn)"
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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": 17,
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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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"Connector<dialect: mysql, dsn: mysql://user:password@127.0.0.1:3306?charset=utf8&timezone=Asia/Shanghai, options: {'charset': ['utf8'], 'timezone': ['Asia/Shanghai']}>\n"
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]
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}
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],
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"source": [
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"mysqldsn = (\n",
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" \"mysql://user:password@127.0.0.1:3306?charset=utf8&timezone=Asia/Shanghai\"\n",
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")\n",
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"database = Database(dsn=mysqldsn, dialect=MySQL)\n",
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"print(database.conn)"
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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": 18,
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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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"Connector<dialect: postgresql, dsn: postgresql://user:password@127.0.0.1:5432?client_encoding=utf8, options: {'client_encoding': ['utf8']}>\n"
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]
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}
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],
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"source": [
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"pgdsn = \"postgresql://user:password@127.0.0.1:5432?client_encoding=utf8\"\n",
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"database = Database(dsn=pgdsn, dialect=PostgreSQL)\n",
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"print(database.conn)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"# Mixin"
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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": 19,
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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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"Tesla<name=Roadster, price=$200,000>\n"
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]
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}
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],
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"source": [
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"class Vehicle:\n",
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" def __init__(self, klass) -> None:\n",
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" self.klass = klass\n",
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"\n",
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" def move(self):\n",
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" raise NotImplementedError\n",
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"\n",
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"\n",
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"class Car(Vehicle):\n",
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" def __init__(self, name) -> None:\n",
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" super().__init__(klass=\"car\")\n",
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" self.name = name\n",
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" self.wheel = 4\n",
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"\n",
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" def move(self):\n",
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" print(f\"Car {self.name} is moving...\")\n",
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"\n",
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"\n",
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"class Tesla(Car):\n",
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" def __init__(self, name, price) -> None:\n",
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" super().__init__(name)\n",
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" self.price = price\n",
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" def __repr__(self) -> str:\n",
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" return f\"Tesla<name={self.name}, price={self.price}>\"\n",
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"\n",
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"\n",
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"roadster = Tesla(\"Roadster\", \"$200,000\")\n",
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"print(roadster)\n"
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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": 20,
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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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"Car Roadster is moving...\n"
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]
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}
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],
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"source": [
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"roadster.move()"
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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": 21,
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"metadata": {},
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"outputs": [],
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"source": [
|
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"class Vehicle:\n",
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" def __init__(self, klass) -> None:\n",
|
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" self.klass = klass\n",
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"\n",
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" def move(self):\n",
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" raise NotImplementedError\n",
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"\n",
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"\n",
|
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"class Car(Vehicle):\n",
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" def __init__(self, name) -> None:\n",
|
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" super().__init__(klass=\"car\")\n",
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" self.name = name\n",
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" self.wheel = 4\n",
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"\n",
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" def move(self):\n",
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" print(f\"Car {self.name} is moving...\")\n",
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"\n",
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"\n",
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"class PowerChargeMixin:\n",
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" def charge(self):\n",
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" import time\n",
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"\n",
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" print(f\"[INFO] {self.name} is charging...\")\n",
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" time.sleep(2)\n",
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" print(\"[INFO] charing over.\")\n",
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"\n",
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"\n",
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"class SentryModeMixin:\n",
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" def watch(self):\n",
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" print(\"[INFO] Turning on sentry mode:\")\n",
|
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" for _ in range(3):\n",
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" print(\"\\tguarding...\")\n",
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"\n",
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"\n",
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"class FastAccelerationMixin:\n",
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" def accelerate(self, speedup):\n",
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" print(f\"[INFO] {self.name} is speeding up to {speedup}...\")\n",
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"\n",
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"\n",
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"class OTAMixin:\n",
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" def upgrade(self):\n",
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" print(f\"[INFO] {self.name}'s OS version is updating...\")\n",
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"\n",
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"\n",
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"class Tesla(\n",
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" PowerChargeMixin,\n",
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" SentryModeMixin,\n",
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" FastAccelerationMixin,\n",
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" OTAMixin,\n",
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" Car,\n",
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"):\n",
|
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" def __init__(self, name, price) -> None:\n",
|
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" super().__init__(name)\n",
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" self.price = price\n",
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"\n",
|
||||
" def __repr__(self) -> str:\n",
|
||||
" return f\"Tesla<name={self.name}, price={self.price}>\"\n"
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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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"metadata": {},
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"outputs": [],
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"source": [
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"roadster = Tesla(\"Roadster\", price=\"$200,000\")\n"
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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": 23,
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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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||||
"[INFO] Roadster is charging...\n",
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"[INFO] charing over.\n"
|
||||
]
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||||
}
|
||||
],
|
||||
"source": [
|
||||
"roadster.charge()\n"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "code",
|
||||
"execution_count": 24,
|
||||
"metadata": {},
|
||||
"outputs": [
|
||||
{
|
||||
"name": "stdout",
|
||||
"output_type": "stream",
|
||||
"text": [
|
||||
"[INFO] Roadster is speeding up to 100m/s...\n"
|
||||
]
|
||||
}
|
||||
],
|
||||
"source": [
|
||||
"roadster.accelerate(\"100m/s\")\n"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "code",
|
||||
"execution_count": 25,
|
||||
"metadata": {},
|
||||
"outputs": [
|
||||
{
|
||||
"name": "stdout",
|
||||
"output_type": "stream",
|
||||
"text": [
|
||||
"[INFO] Roadster's OS version is updating...\n"
|
||||
]
|
||||
}
|
||||
],
|
||||
"source": [
|
||||
"roadster.upgrade()\n"
|
||||
]
|
||||
},
|
||||
{
|
||||
"cell_type": "code",
|
||||
"execution_count": 26,
|
||||
"metadata": {},
|
||||
"outputs": [
|
||||
{
|
||||
"name": "stdout",
|
||||
"output_type": "stream",
|
||||
"text": [
|
||||
"[INFO] Turning on sentry mode:\n",
|
||||
"\tguarding...\n",
|
||||
"\tguarding...\n",
|
||||
"\tguarding...\n"
|
||||
]
|
||||
}
|
||||
],
|
||||
"source": [
|
||||
"roadster.watch()"
|
||||
]
|
||||
}
|
||||
],
|
||||
"metadata": {
|
||||
"kernelspec": {
|
||||
"display_name": "Python 3.9.0 ('pandas-startup')",
|
||||
"language": "python",
|
||||
"name": "python3"
|
||||
},
|
||||
"language_info": {
|
||||
"codemirror_mode": {
|
||||
"name": "ipython",
|
||||
"version": 3
|
||||
},
|
||||
"file_extension": ".py",
|
||||
"mimetype": "text/x-python",
|
||||
"name": "python",
|
||||
"nbconvert_exporter": "python",
|
||||
"pygments_lexer": "ipython3",
|
||||
"version": "3.9.0"
|
||||
},
|
||||
"orig_nbformat": 4,
|
||||
"vscode": {
|
||||
"interpreter": {
|
||||
"hash": "13977d4cc82dee5f9d9535ceb495bd0ab12a43c33c664e5f0d53c24cf634b67f"
|
||||
}
|
||||
}
|
||||
},
|
||||
"nbformat": 4,
|
||||
"nbformat_minor": 2
|
||||
}
|
||||
48
code/newsletter/N5/exceptions.py
Normal file
48
code/newsletter/N5/exceptions.py
Normal file
@@ -0,0 +1,48 @@
|
||||
class InvalidTypeError(Exception):
|
||||
def __init__(self, value, code, detail, *args) -> None:
|
||||
super().__init__(value, *args)
|
||||
self.code = code
|
||||
self.detail = detail
|
||||
|
||||
def __repr__(self) -> str:
|
||||
return self.detail
|
||||
|
||||
|
||||
def check(v, klass):
|
||||
klass_names = [k.__name__ for k in klass]
|
||||
|
||||
if not isinstance(v, tuple(klass)):
|
||||
raise InvalidTypeError(
|
||||
f"{v.__class__.__name__} class is unknown, use {klass_names}.",
|
||||
code=500,
|
||||
detail={"value": v, "type": v.__class__.__name__},
|
||||
)
|
||||
return v
|
||||
|
||||
|
||||
def add(a, b):
|
||||
klass = [int, float]
|
||||
try:
|
||||
a = check(a, klass)
|
||||
b = check(b, klass)
|
||||
except InvalidTypeError as e:
|
||||
error = {
|
||||
"name": InvalidTypeError.__name__,
|
||||
"code": e.code,
|
||||
"detail": e.detail,
|
||||
}
|
||||
raise TypeError(error) from e
|
||||
|
||||
return a + b
|
||||
|
||||
|
||||
def main():
|
||||
|
||||
try:
|
||||
print(add(1, "2"))
|
||||
except TypeError as e:
|
||||
print(e.args)
|
||||
|
||||
|
||||
if __name__ == '__main__':
|
||||
main()
|
||||
22
code/newsletter/N5/generator.py
Normal file
22
code/newsletter/N5/generator.py
Normal file
@@ -0,0 +1,22 @@
|
||||
def make_cards(values):
|
||||
container = values or []
|
||||
for value in container:
|
||||
yield value
|
||||
|
||||
|
||||
def main():
|
||||
from collections.abc import Generator
|
||||
|
||||
cards = make_cards(list("JQK"))
|
||||
print(cards)
|
||||
|
||||
print(f"Is the cards variable a generator? {isinstance(cards, Generator)}")
|
||||
for card in cards:
|
||||
print(card)
|
||||
|
||||
results = list(cards)
|
||||
print(results)
|
||||
|
||||
|
||||
if __name__ == '__main__':
|
||||
main()
|
||||
42
code/newsletter/N5/iter.py
Normal file
42
code/newsletter/N5/iter.py
Normal file
@@ -0,0 +1,42 @@
|
||||
class CardGroup:
|
||||
def __init__(self, container) -> None:
|
||||
self.container = container
|
||||
self.index = 0
|
||||
|
||||
def __iter__(self):
|
||||
return self
|
||||
|
||||
def __next__(self):
|
||||
if self.index < len(self.container):
|
||||
value = self.container[self.index]
|
||||
self.index += 1
|
||||
else:
|
||||
raise StopIteration
|
||||
return value
|
||||
|
||||
|
||||
class Cards:
|
||||
def __init__(self, values=None) -> None:
|
||||
self._container = values or []
|
||||
|
||||
def __iter__(self):
|
||||
return CardGroup(self._container)
|
||||
|
||||
def __getitem__(self, index):
|
||||
return self._container[index]
|
||||
|
||||
|
||||
def main():
|
||||
from collections.abc import Iterable
|
||||
|
||||
cards = Cards(list("JQK"))
|
||||
print(f"Is the cards variable an iterale? {isinstance(cards, Iterable)}")
|
||||
|
||||
for card in cards:
|
||||
print(card)
|
||||
|
||||
print(cards[1:])
|
||||
|
||||
|
||||
if __name__ == '__main__':
|
||||
main()
|
||||
Reference in New Issue
Block a user