Дописана проверка на существующего пользователя при регистрации

__init__.py

@@ -1,7 +1,10 @@
 from flask import Flask, render_template, flash, redirect, url_for, session, logging, request
 from flask_sqlalchemy import SQLAlchemy
+import os
+import hashlib
+import sqlite3
 
-app = Flask(__name__, static_folder="static", template_folder="templates")
+app = Flask(__name__, static_folder='static', template_folder='templates')
 app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///data.db'
 db = SQLAlchemy(app)
 
@@ -11,28 +14,47 @@ def index():
     return render_template('index.html')
 
 
-@app.route("/registration", methods=["GET", "POST"])
+@app.route('/registraion', methods=['GET', 'POST'])
 def register():
-    if request.method == "POST":
-
+    if request.method == 'POST':
         UserLogin = request.form['UserLogin']
         UserPass = request.form['UserPass']
+        if not find_user_copy(UserLogin):
+            db.session.add(UserLogin, passw_hash(UserPass))
+            db.session.commit()
+    return render_template('registration.html')
 
-        #db.session.add(UserLogin, UserPass)
-        #db.session.commit()
 
-        #return redirect(url_for(""))
+@app.route('/content', methods=['GET'])
+def content():
+    return render_template('content.html')
 
-        print(UserLogin, ' ', UserPass)
-        # return страница с контентом
 
-    return render_template("registration.html")
+@app.errorhandler(404)
+def not_found(error):
+    return render_template('404.html'), 404
 
 
+def find_user_copy(user_login):
+    con = sqlite3.connect('data.db')
+    with con:
+        cur = con.cursor()
+        exist = cur.execute('SELECT EXISTS ( SELECT UserLogin FROM Users Where UserLogin = ' + user_login + ' LIMIT 1')
+    return exist
+
+
+def passw_hash(user_passw):
+    salt = os.urandom(32)
+    key = hashlib.pbkdf2_hmac('sha256', user_passw.encode('utf-8'), salt, 100000)
+    storage = salt + key
+    # salt_from_storage = storage[:32]  # 32 длина соли
+    # key_from_storage = storage[32:]
+    return storage
+
 # @app.route('/login', methods=['GET'])
 # def login():
 #    return render_template('login.html')
 
 
-if __name__ == "__main__":
+if __name__ == '__main__':
     app.run()