codigo do app.py

app.py

+from flask import Flask, render_template, request, redirect
+from models import db, Animal
+
+app = Flask(__name__)
+app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///animais.db'
+
+db.init_app(app)
+
+with app.app_context():
+    db.create_all()
+

models.py

+from flask_sqlalchemy import SQLAlchemy
+
+db = SQLAlchemy()
+
+class Animal(db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    nome = db.Column(db.String(100))
+    especie = db.Column(db.String(100))
+    idade = db.Column(db.Integer)
+    peso = db.Column(db.Float)
+    
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