488 lines
11 KiB
Plaintext
488 lines
11 KiB
Plaintext
{
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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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"## 定义数据类"
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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": 1,
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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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"User(username='100gle', password='password', email='email@example.com', is_vip=False)"
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]
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},
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"execution_count": 1,
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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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"source": [
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"import attrs\n",
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"\n",
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"\n",
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"@attrs.define\n",
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"class User:\n",
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" username: str\n",
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" password: str\n",
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" email: str\n",
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" is_vip: bool = False\n",
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"\n",
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"User(\"100gle\", \"password\", email=\"email@example.com\")"
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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": 2,
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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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"User(username='100gle', password=***, email='email@example.com')"
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]
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},
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"execution_count": 2,
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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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"source": [
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"@attrs.define\n",
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"class User:\n",
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" username: str\n",
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" password: str = attrs.field(repr=lambda v: \"***\")\n",
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" email: str\n",
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" is_vip: bool = attrs.field(default=False, repr=False)\n",
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"\n",
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"User(\"100gle\", \"password\", email=\"email@example.com\")"
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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": 3,
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"metadata": {},
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"outputs": [],
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"source": [
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"from datetime import datetime\n",
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"\n",
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"import attrs\n",
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"\n",
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"\n",
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"@attrs.define\n",
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"class User:\n",
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" username: str\n",
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" email: str\n",
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" _password: str = attrs.field(repr=lambda v: \"***\")\n",
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" _is_vip: bool = attrs.field(init=False, default=False, repr=False)\n",
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" _recent_login_at: datetime = attrs.field(init=False, default=datetime.now())"
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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": 4,
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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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"User(username='100gle', email='email@example.com', _password=***, _recent_login_at=datetime.datetime(2022, 11, 19, 10, 44, 48, 848285))"
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]
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},
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"execution_count": 4,
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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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"source": [
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"User(\"100gle\", email=\"email@example.com\", password=\"password\")"
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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": 5,
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"metadata": {},
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"outputs": [],
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"source": [
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"from datetime import datetime\n",
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"\n",
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"import attr\n",
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"\n",
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"\n",
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"@attr.s\n",
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"class User:\n",
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" username = attr.ib(type=str)\n",
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" email = attr.ib(type=str)\n",
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" _password = attr.ib(repr=lambda v: \"***\")\n",
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" _is_vip = attr.ib(default=False, repr=False)\n",
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" _recent_login_at = attr.ib(init=False, default=datetime.now())"
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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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"## 自定义字段校验逻辑"
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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": 6,
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"metadata": {},
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"outputs": [],
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"source": [
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"class LimitError(Exception):\n",
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" pass\n",
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"\n",
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"\n",
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"@attrs.define\n",
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"class User:\n",
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" username: str\n",
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" email: str = attrs.field()\n",
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" _password: str = attrs.field(repr=lambda v: \"***\")\n",
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" _is_vip: bool = attrs.field(default=False, repr=False)\n",
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" _recent_login_at: datetime = attrs.field(init=False, default=datetime.now())\n",
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"\n",
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" @email.validator\n",
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" def _check_email(self, attribute, value: str):\n",
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" if not \"@\" in value:\n",
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" raise ValueError(\"invalid email that doesn't contains an '@' symbol\")\n",
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"\n",
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" if len(value) >= 15:\n",
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" raise LimitError(\"email out of the max length of 15 chars\")\n",
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"\n",
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" return 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": 7,
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"metadata": {},
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"outputs": [],
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"source": [
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"# User(\"100gle\", email=\"email#example.com\", password=\"password\") # raise ValueError here!"
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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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"import attrs\n",
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"\n",
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"class LimitError(Exception):\n",
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" pass\n",
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"\n",
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"def check_email_validation(instance, attribute, value: str):\n",
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" if not \"@\" in value:\n",
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" raise ValueError(\"invalid email that doesn't contains an '@' symbol\")\n",
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"\n",
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"\n",
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"def check_email_length(instance, attribute, value: str):\n",
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" if len(value) >= 15:\n",
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" raise LimitError(\"email out of the max length of 15 chars\")\n",
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"\n",
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"@attrs.define\n",
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"class User:\n",
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" username: str\n",
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" email: str = attrs.field(\n",
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" validator=[\n",
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" check_email_validation,\n",
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" check_email_length,\n",
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" ]\n",
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" )\n",
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" _password: str = attrs.field(repr=lambda v: \"***\")\n",
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" _is_vip: bool = attrs.field(default=False, repr=False)\n",
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" _recent_login_at: datetime = attrs.field(init=False, default=datetime.now())\n",
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"\n",
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" @email.validator\n",
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" def _check_email_suffix(self, attribute, value: str):\n",
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" if not value.endswith(\"com\"):\n",
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" raise ValueError(\"invalid domain\")\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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"# User(\"100gle\", email=\"email#example.com\", password=\"password\") # raise ValueError here!"
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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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"## 自定义转换器"
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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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"source": [
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"@attrs.define\n",
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"class C:\n",
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" x: int = attrs.field(converter=int)"
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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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{
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"data": {
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"text/plain": [
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"1"
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]
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},
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"execution_count": 11,
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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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"source": [
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"o = C(\"1\")\n",
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"o.x\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": 12,
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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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"int"
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]
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},
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"execution_count": 12,
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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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"source": [
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"type(o.x)"
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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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"from datetime import datetime\n",
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"\n",
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"import attrs\n",
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"\n",
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"\n",
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"class LimitError(Exception):\n",
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" pass\n",
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"\n",
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"\n",
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"def fix_invalid_email(value: str) -> str:\n",
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" if not \"@\" in value and \"#\" in value:\n",
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" return value.replace(\"#\", \"@\")\n",
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" return value\n",
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"\n",
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"@attrs.define\n",
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"class User:\n",
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" username: str\n",
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" email: str = attrs.field(converter=fix_invalid_email)\n",
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" _password: str = attrs.field(repr=lambda v: \"***\")\n",
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" _is_vip: bool = attrs.field(default=False, repr=False)\n",
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" _recent_login_at: datetime = attrs.field(init=False, default=datetime.now())\n",
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"\n",
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" @email.validator\n",
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" def _check_email_suffix(self, attribute, value: str):\n",
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" if not value.endswith(\"com\"):\n",
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" raise ValueError(\"invalid domain\")"
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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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{
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"data": {
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"text/plain": [
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"User(username='100gle', email='email@example.com', _password=***, _recent_login_at=datetime.datetime(2022, 11, 19, 10, 44, 49, 229669))"
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]
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},
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"execution_count": 14,
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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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"source": [
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"User(\"100gle\", email=\"email#example.com\", password=\"password\")"
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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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"# User(\"100gle\", email=\"email@example.net\", password=\"password\") # raise ValueError here!"
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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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"## 导出数据类"
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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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"data": {
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"text/plain": [
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"{'username': '100gle',\n",
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" 'email': 'email@example.com',\n",
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" '_password': 'password',\n",
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" '_is_vip': False,\n",
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" '_recent_login_at': datetime.datetime(2022, 11, 19, 10, 44, 49, 229669)}"
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]
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},
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"execution_count": 16,
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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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"source": [
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"user = User(\"100gle\", email=\"email#example.com\", password=\"password\")\n",
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"attrs.asdict(user)"
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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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"data": {
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"text/plain": [
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"{'username': '100gle', 'email': 'email@example.com'}"
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]
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},
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"execution_count": 17,
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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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"source": [
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"attrs.asdict(\n",
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" user,\n",
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" filter=lambda attr, value: not attr.name.startswith(\"_\"),\n",
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")"
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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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"data": {
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"text/plain": [
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"{'username': '100gle', 'email': 'email@example.com'}"
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]
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},
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"execution_count": 18,
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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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"source": [
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"from attrs import fields, filters\n",
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"\n",
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"attrs.asdict(\n",
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" user,\n",
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" filter=filters.include(\n",
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" fields(User).username,\n",
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" fields(User).email,\n",
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" ),\n",
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")"
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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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"data": {
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"text/plain": [
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"{'username': '100gle', 'email': 'email@example.com'}"
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]
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},
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"execution_count": 19,
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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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"source": [
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"attrs.asdict(\n",
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" user,\n",
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" filter=filters.exclude(\n",
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" fields(User)._password,\n",
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" fields(User)._is_vip,\n",
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" datetime,\n",
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" ),\n",
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")"
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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": null,
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"metadata": {},
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"outputs": [],
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"source": []
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}
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],
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"metadata": {
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"kernelspec": {
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"display_name": "Python 3.9.0 ('pandas-startup')",
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"language": "python",
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"name": "python3"
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},
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"language_info": {
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"codemirror_mode": {
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"name": "ipython",
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"version": 3
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},
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"file_extension": ".py",
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"mimetype": "text/x-python",
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"name": "python",
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"nbconvert_exporter": "python",
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"pygments_lexer": "ipython3",
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"version": "3.9.0"
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},
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"orig_nbformat": 4,
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"vscode": {
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"interpreter": {
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"hash": "13977d4cc82dee5f9d9535ceb495bd0ab12a43c33c664e5f0d53c24cf634b67f"
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}
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}
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},
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"nbformat": 4,
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"nbformat_minor": 2
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}
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