Models à finir !!

models.py

+from flask import Flask
+from flask_sqlalchemy import SQLAlchemy
+
+db = SQLAlchemy()
+
+
+class Element(db.Model)
+    id = db.Column(db.INTEGER, primary_key=True)
+    element_name = db.Column(db.String(50), unique=True, nullable=False)
+
+class Label(db.Model)
+    id = db.Column(db.INTEGER, primary_key=True)
+    label_name = db.Column(db.String(50), unique=True, nullable=False)
+    father_id = db.Column(db.INTEGER, db.ForeignKey('label.id'))
+