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• Файл app.py

  		
  		from flask import Flask, render_template, redirect, request, session
  		from flask_session import Session
  
  		# конфигурируем приложение
  		app = Flask(__name__)
  
  		# Конфигурируем сессию
  		app.config["SESSION_PREMANENT"]  = False
  		app.config["SESSION_TYPE"] = "filesystem"
  		Session(app)
  
  		@app.route("/")
  		def index():
  		    if not session.get("name"):
  			return redirect("/login")
  		    return render_template("index.html")
  
  
  		@app.route("/login", methods=["GET", "POST"])
  		def login():
  		    if request.method == "POST":
  			session["name"] = request.form.get("name")
  			return redirect("/")
  		    return render_template("login.html")
  
  
  		@app.route("/logout")
  		def logout():
  		    session["name"] = None
  		    return redirect("/")
  		
  		

• Создадим index.html

• Создадим login.html

• Выполним flask run.

Вход с паролем

• Создадим файл базы данных

  		
  		sqlite3 hogwarts.db
  		
  		

• Создадим таблицу и вставим в данные.

  		
  create table 'characters' ('id' integer primary key autoincrement, 'username' varchar(255) not null, 'password' varchar(255) not null);
  insert into 'characters' ('username', 'password') values ('potter', '12345');
  insert into 'characters' ('username', 'password') values ('ron', '12345');
  .quit
  
  		

• Создадим app.py

  		
  from flask import Flask, render_template, redirect, request, session
  from flask_session import Session
  
  # Соединение с базой данных
  from sqlalchemy import create_engine
  from sqlalchemy.orm import scoped_session, sessionmaker
  from sqlalchemy.sql import text
  url="sqlite:///hogwarts.db"
  engine = create_engine(url)
  db = scoped_session(sessionmaker(bind=engine))
  
  # конфигурируем приложение
  app = Flask(__name__)
  
  # Конфигурируем сессию
  app.config["SESSION_PREMANENT"]  = False
  app.config["SESSION_TYPE"] = "filesystem"
  Session(app)
  
  @app.route("/")
  def index():
      if not session.get("username"):
          return redirect("/login")
      return render_template("index.html")
  
  
  @app.route("/login", methods=["GET", "POST"])
  def login():
      if request.method == "POST":
          username = request.form.get("username")
          password = request.form.get("password")
          row = db.execute(text("select * from 'characters' where username= :username and password=:password"), 
                  {"username": username, "password": password}).fetchone()
          if row: 
              session["username"] = row.username
              session["id"] = row.id
              return redirect("/")
      return render_template("login.html")
  
  
  @app.route("/logout")
  def logout():
      session["username"] = None
      session["id"] = None
      return redirect("/")
      		
  		

• Файл index.html.

• Создадим login.html

• Создадим файл requirements.txt.

  		
  		Flask
  		Flask-session
  		Sqlalchemy
  		Gunicorn