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| { | |
| "cells": [ | |
| { | |
| "metadata": {}, | |
| "id": "caring-effectiveness", | |
| "cell_type": "markdown", | |
| "source": "### ORM: SQLAlchemy" | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "prescribed-binding", | |
| "cell_type": "code", | |
| "source": "%pip install sqlalchemy", | |
| "execution_count": 1, | |
| "outputs": [ | |
| { | |
| "name": "stdout", | |
| "output_type": "stream", | |
| "text": "Requirement already satisfied: sqlalchemy in /Users/user/miniconda3/envs/featurevis-py3.6/lib/python3.6/site-packages (1.3.22)\nNote: you may need to restart the kernel to use updated packages.\n" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "secondary-painting", | |
| "cell_type": "code", | |
| "source": "from sqlalchemy import create_engine\n\nfrom sqlalchemy.ext.declarative import declarative_base\n\nBase = declarative_base()\n\nfrom sqlalchemy import Column, Integer, String\n\nclass User(Base):\n __tablename__ = \"user\"\n \n id = Column(Integer, primary_key=True)\n username = Column(String)\n nickname = Column(String)\n age = Column(Integer)\n \n def __repr__(self):\n return f\"User(username={self.username!r}, nickname={self.nickname!r}, age={self.age!r})\"", | |
| "execution_count": 3, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "proprietary-montreal", | |
| "cell_type": "code", | |
| "source": "alice = User(username=\"alice\", nickname=\"Alice Smith\", age=18)\nbob = User(username='bobby', nickname='BOB', age=19)", | |
| "execution_count": 4, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "authorized-toilet", | |
| "cell_type": "code", | |
| "source": "alice", | |
| "execution_count": 5, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "User(username='alice', nickname='Alice Smith', age=18)" | |
| }, | |
| "execution_count": 5, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "hawaiian-watershed", | |
| "cell_type": "code", | |
| "source": "alice.username", | |
| "execution_count": 6, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "'alice'" | |
| }, | |
| "execution_count": 6, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "signed-insulin", | |
| "cell_type": "code", | |
| "source": "alice.age", | |
| "execution_count": 7, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "18" | |
| }, | |
| "execution_count": 7, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "overhead-static", | |
| "cell_type": "code", | |
| "source": "engine = create_engine('sqlite:///my_users.sqlite', echo=True)\nBase.metadata.create_all(engine)", | |
| "execution_count": 8, | |
| "outputs": [ | |
| { | |
| "name": "stdout", | |
| "output_type": "stream", | |
| "text": "2021-04-14 18:23:05,316 INFO sqlalchemy.engine.base.Engine SELECT CAST('test plain returns' AS VARCHAR(60)) AS anon_1\n2021-04-14 18:23:05,317 INFO sqlalchemy.engine.base.Engine ()\n2021-04-14 18:23:05,319 INFO sqlalchemy.engine.base.Engine SELECT CAST('test unicode returns' AS VARCHAR(60)) AS anon_1\n2021-04-14 18:23:05,320 INFO sqlalchemy.engine.base.Engine ()\n2021-04-14 18:23:05,322 INFO sqlalchemy.engine.base.Engine PRAGMA main.table_info(\"user\")\n2021-04-14 18:23:05,322 INFO sqlalchemy.engine.base.Engine ()\n2021-04-14 18:23:05,324 INFO sqlalchemy.engine.base.Engine PRAGMA temp.table_info(\"user\")\n2021-04-14 18:23:05,325 INFO sqlalchemy.engine.base.Engine ()\n2021-04-14 18:23:05,327 INFO sqlalchemy.engine.base.Engine \nCREATE TABLE user (\n\tid INTEGER NOT NULL, \n\tusername VARCHAR, \n\tnickname VARCHAR, \n\tage INTEGER, \n\tPRIMARY KEY (id)\n)\n\n\n2021-04-14 18:23:05,328 INFO sqlalchemy.engine.base.Engine ()\n2021-04-14 18:23:05,330 INFO sqlalchemy.engine.base.Engine COMMIT\n" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "unnecessary-norway", | |
| "cell_type": "code", | |
| "source": "from sqlalchemy.orm import sessionmaker\nSession = sessionmaker(bind=engine)\nsession = Session()", | |
| "execution_count": 9, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "nearby-rugby", | |
| "cell_type": "code", | |
| "source": "session.add(alice)", | |
| "execution_count": 10, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "reported-prince", | |
| "cell_type": "code", | |
| "source": "session.add(bob)", | |
| "execution_count": 11, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": { | |
| "scrolled": true, | |
| "trusted": false | |
| }, | |
| "id": "occupational-steal", | |
| "cell_type": "code", | |
| "source": "session.commit()", | |
| "execution_count": 12, | |
| "outputs": [ | |
| { | |
| "name": "stdout", | |
| "output_type": "stream", | |
| "text": "2021-04-14 18:24:19,160 INFO sqlalchemy.engine.base.Engine BEGIN (implicit)\n2021-04-14 18:24:19,162 INFO sqlalchemy.engine.base.Engine INSERT INTO user (username, nickname, age) VALUES (?, ?, ?)\n2021-04-14 18:24:19,163 INFO sqlalchemy.engine.base.Engine ('alice', 'Alice Smith', 18)\n2021-04-14 18:24:19,165 INFO sqlalchemy.engine.base.Engine INSERT INTO user (username, nickname, age) VALUES (?, ?, ?)\n2021-04-14 18:24:19,166 INFO sqlalchemy.engine.base.Engine ('bobby', 'BOB', 19)\n2021-04-14 18:24:19,167 INFO sqlalchemy.engine.base.Engine COMMIT\n" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "chicken-setup", | |
| "cell_type": "code", | |
| "source": "from sqlalchemy import create_engine\n\nfrom sqlalchemy.ext.declarative import declarative_base\n\nBase = declarative_base()\n\nfrom sqlalchemy import Column, Integer, String\n\nclass User(Base):\n __tablename__ = \"user\"\n \n id = Column(Integer, primary_key=True)\n username = Column(String)\n nickname = Column(String)\n age = Column(Integer)\n \n def __repr__(self):\n return f\"User(username={self.username!r}, nickname={self.nickname!r}, age={self.age!r})\"\n \n def say_hello(self):\n print(f\"Hello, I'm {self.nickname}!\")\n\n \nengine = create_engine('sqlite:///my_users.sqlite', echo=True)\n\nfrom sqlalchemy.orm import sessionmaker\nSession = sessionmaker(bind=engine)\nsession = Session()", | |
| "execution_count": 1, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "digital-litigation", | |
| "cell_type": "code", | |
| "source": "users = session.query(User).all()\n# SELECT * FROM user", | |
| "execution_count": 2, | |
| "outputs": [ | |
| { | |
| "name": "stdout", | |
| "output_type": "stream", | |
| "text": "2021-04-18 20:14:15,238 INFO sqlalchemy.engine.base.Engine SELECT CAST('test plain returns' AS VARCHAR(60)) AS anon_1\n2021-04-18 20:14:15,239 INFO sqlalchemy.engine.base.Engine ()\n2021-04-18 20:14:15,241 INFO sqlalchemy.engine.base.Engine SELECT CAST('test unicode returns' AS VARCHAR(60)) AS anon_1\n2021-04-18 20:14:15,242 INFO sqlalchemy.engine.base.Engine ()\n2021-04-18 20:14:15,243 INFO sqlalchemy.engine.base.Engine BEGIN (implicit)\n2021-04-18 20:14:15,245 INFO sqlalchemy.engine.base.Engine SELECT user.id AS user_id, user.username AS user_username, user.nickname AS user_nickname, user.age AS user_age \nFROM user\n2021-04-18 20:14:15,245 INFO sqlalchemy.engine.base.Engine ()\n" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "material-society", | |
| "cell_type": "code", | |
| "source": "users[0].username", | |
| "execution_count": 3, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "'alice'" | |
| }, | |
| "execution_count": 3, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "stopped-scott", | |
| "cell_type": "code", | |
| "source": "users[0].say_hello()", | |
| "execution_count": 4, | |
| "outputs": [ | |
| { | |
| "name": "stdout", | |
| "output_type": "stream", | |
| "text": "Hello, I'm Alice Smith!\n" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "judicial-pennsylvania", | |
| "cell_type": "code", | |
| "source": "session.query(User).filter(User.age >= 19).all()\n# SELECT * FROM user WHERE user.age >= 19", | |
| "execution_count": 5, | |
| "outputs": [ | |
| { | |
| "name": "stdout", | |
| "output_type": "stream", | |
| "text": "2021-04-18 20:14:38,257 INFO sqlalchemy.engine.base.Engine SELECT user.id AS user_id, user.username AS user_username, user.nickname AS user_nickname, user.age AS user_age \nFROM user \nWHERE user.age >= ?\n2021-04-18 20:14:38,259 INFO sqlalchemy.engine.base.Engine (19,)\n" | |
| }, | |
| { | |
| "data": { | |
| "text/plain": "[User(username='bobby', nickname='BOB', age=19)]" | |
| }, | |
| "execution_count": 5, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": {}, | |
| "id": "successful-straight", | |
| "cell_type": "markdown", | |
| "source": "### SQL-injections" | |
| }, | |
| { | |
| "metadata": {}, | |
| "id": "opposed-reporter", | |
| "cell_type": "markdown", | |
| "source": "Рассмотрим такой код:\n\n```\nuser = input(\"Enter username\")\npasswd = input(\"Enter password\")\nconn = sqlite3.connect(\"database.sqlite\")\nc = conn.cursor()\nc.execute(f\"SELECT * FROM user WHERE user.username == '{user}'\")\n```\nЕсли `user` окажется равен `'; DROP TABLE user; --`, окажется выполненным следующий запрос:\n\n\n```\nSELECT * FROM user WHERE user.username == ''; DROP TABLE user; --'\n```\n\nМногие движки баз данных будут рассматривать его как три отдельных строчки, разделяя по точке с запятой.\n\n```\nSELECT * FROM user WHERE user.username == '';\nDROP TABLE user;\n--'\n```\n\nпоследняя строчка — комментарий (они начинаются в SQL с `--`), первая запрашивает пользователя с пустым именем, а вторая — удаляет базу данных пользователей.\n\nОй.\n\nПоэтому формировать SQL-запросы с помощью подстановки каких-то переменных вручную нельзя — есть риск нарваться на такую SQL injection.\n\nНадо делать так:\n\n```\nc.execute(\"SELECT * FROM user WHERE user.username == ?\", (user, ))\n```\n\nВ этом случае `sqlite` сам подставит значение переменной вместо знака вопроса. Если знаков вопроса несколько, будут подставлены соответствующие элементы кортежа.\n\nДругой способ избежать sql-injections — использовать ORM типа sqlalchemy, как показано выше. В этом случае вы совсем не пишете SQL-код и не рискуете написать его неправильно." | |
| }, | |
| { | |
| "metadata": {}, | |
| "cell_type": "markdown", | |
| "source": "## Регулярные выражения" | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": true | |
| }, | |
| "id": "gorgeous-continuity", | |
| "cell_type": "code", | |
| "source": "text = \"\"\"\nHello! My name is Alice. I'm 29. My phone is +7-919-99-912321.\n\nHello, Alice. My name is Bob Smith. I'm 25 years old. \nMy tel. is +7-991-199992836. How are you?\n\nWhat is 45+49?\n\"\"\"", | |
| "execution_count": 2, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "finite-study", | |
| "cell_type": "code", | |
| "source": "import re", | |
| "execution_count": 21, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "developing-croatia", | |
| "cell_type": "code", | |
| "source": "re.findall(r\"[+\\d-]{5,}\", text)", | |
| "execution_count": 22, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "['+7-919-99-912321', '+7-991-199992836', '45+49']" | |
| }, | |
| "execution_count": 22, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "minute-orange", | |
| "cell_type": "code", | |
| "source": "print(r\"\\n\")", | |
| "execution_count": 24, | |
| "outputs": [ | |
| { | |
| "name": "stdout", | |
| "output_type": "stream", | |
| "text": "\\n\n" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "impressed-offer", | |
| "cell_type": "code", | |
| "source": "print(\"\\n\")", | |
| "execution_count": 25, | |
| "outputs": [ | |
| { | |
| "name": "stdout", | |
| "output_type": "stream", | |
| "text": "\n\n" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "sustained-avenue", | |
| "cell_type": "code", | |
| "source": "data = \"\"\"\nFirst name: Alice\nLast name: Smith\nTelephone: +7 916 900998876\n\"\"\"", | |
| "execution_count": 26, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "activated-consolidation", | |
| "cell_type": "code", | |
| "source": "m = re.search(\"First name: (.+)\", data)", | |
| "execution_count": 33, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "alive-auction", | |
| "cell_type": "code", | |
| "source": "m.group(1)", | |
| "execution_count": 36, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "'Alice'" | |
| }, | |
| "execution_count": 36, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "automotive-taiwan", | |
| "cell_type": "code", | |
| "source": "text", | |
| "execution_count": 37, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "\"\\nHello! My name is Alice. I'm 29. My phone is +7-919-99-912321.\\n\\nHello, Alice. My name is Bob Smith. I'm 25 years old. \\nMy tel. is +7-991-199992836. How are you?\\n\\nWhat is 45+49?\\n\"" | |
| }, | |
| "execution_count": 37, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "powerful-stations", | |
| "cell_type": "code", | |
| "source": "re.split(r\"[\\n! \\.,']+\", text)", | |
| "execution_count": 40, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "['',\n 'Hello',\n 'My',\n 'name',\n 'is',\n 'Alice',\n 'I',\n 'm',\n '29',\n 'My',\n 'phone',\n 'is',\n '+7-919-99-912321',\n 'Hello',\n 'Alice',\n 'My',\n 'name',\n 'is',\n 'Bob',\n 'Smith',\n 'I',\n 'm',\n '25',\n 'years',\n 'old',\n 'My',\n 'tel',\n 'is',\n '+7-991-199992836',\n 'How',\n 'are',\n 'you?',\n 'What',\n 'is',\n '45+49?',\n '']" | |
| }, | |
| "execution_count": 40, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "another-parcel", | |
| "cell_type": "code", | |
| "source": "re.sub(\"\\d\", \"*\", text)", | |
| "execution_count": 42, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "\"\\nHello! My name is Alice. I'm **. My phone is +*-***-**-******.\\n\\nHello, Alice. My name is Bob Smith. I'm ** years old. \\nMy tel. is +*-***-*********. How are you?\\n\\nWhat is **+**?\\n\"" | |
| }, | |
| "execution_count": 42, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "continuous-columbus", | |
| "cell_type": "code", | |
| "source": "re.sub(\"(\\d|\\+)\", \"*\", text)", | |
| "execution_count": 43, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "\"\\nHello! My name is Alice. I'm **. My phone is **-***-**-******.\\n\\nHello, Alice. My name is Bob Smith. I'm ** years old. \\nMy tel. is **-***-*********. How are you?\\n\\nWhat is *****?\\n\"" | |
| }, | |
| "execution_count": 43, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "mounted-meditation", | |
| "cell_type": "code", | |
| "source": "m", | |
| "execution_count": 50, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "<_sre.SRE_Match object; span=(1, 18), match='First name: Alice'>" | |
| }, | |
| "execution_count": 50, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "fundamental-avatar", | |
| "cell_type": "code", | |
| "source": "def digit_to_word(d):\n return {0: '[ноль]', \n 1: '[один]',\n 2: '[два]', \n 3: '[три]'}.get(int(d.group(0)), d.group(0))", | |
| "execution_count": 51, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "champion-prime", | |
| "cell_type": "code", | |
| "source": "re.sub(\"\\d\", digit_to_word, text)", | |
| "execution_count": 52, | |
| "outputs": [ | |
| { | |
| "data": { | |
| "text/plain": "\"\\nHello! My name is Alice. I'm [два]9. My phone is +7-9[один]9-99-9[один][два][три][два][один].\\n\\nHello, Alice. My name is Bob Smith. I'm [два]5 years old. \\nMy tel. is +7-99[один]-[один]9999[два]8[три]6. How are you?\\n\\nWhat is 45+49?\\n\"" | |
| }, | |
| "execution_count": 52, | |
| "metadata": {}, | |
| "output_type": "execute_result" | |
| } | |
| ] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "alpine-maximum", | |
| "cell_type": "code", | |
| "source": "text = \"\"\"\nAlpha Beta\nGamma Delta\n\"\"\"", | |
| "execution_count": 53, | |
| "outputs": [] | |
| }, | |
| { | |
| "metadata": { | |
| "trusted": false | |
| }, | |
| "id": "polyphonic-trance", | |
| "cell_type": "code", | |
| "source": "print(re.sub(r\"(\\w+)\\W(\\w+)$\", r\"\\2, \\1\", text, flags=re.MULTILINE))", | |
| "execution_count": 60, | |
| "outputs": [ | |
| { | |
| "name": "stdout", | |
| "output_type": "stream", | |
| "text": "\nBeta, Alpha\nDelta, Gamma\n\n" | |
| } | |
| ] | |
| }, | |
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| "text/plain": " 0 1 2 3\n0 l h \n1 bet None None\n2 g mm None" | |
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