✨ Add source examples for docs

docs_src/tutorial/where/tutorial007.py

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+from typing import Optional
+
+from sqlmodel import Field, Session, SQLModel, create_engine, select
+
+
+class Hero(SQLModel, table=True):
+    id: Optional[int] = Field(default=None, primary_key=True)
+    name: str
+    secret_name: str
+    age: Optional[int] = None
+
+
+sqlite_file_name = "database.db"
+sqlite_url = f"sqlite:///{sqlite_file_name}"
+
+engine = create_engine(sqlite_url, echo=True)
+
+
+def create_db_and_tables():
+    SQLModel.metadata.create_all(engine)
+
+
+def create_heroes():
+    hero_1 = Hero(name="Deadpond", secret_name="Dive Wilson")
+    hero_2 = Hero(name="Spider-Boy", secret_name="Pedro Parqueador")
+    hero_3 = Hero(name="Rusty-Man", secret_name="Tommy Sharp", age=48)
+    hero_4 = Hero(name="Tarantula", secret_name="Natalia Roman-on", age=32)
+    hero_5 = Hero(name="Black Lion", secret_name="Trevor Challa", age=35)
+    hero_6 = Hero(name="Dr. Weird", secret_name="Steve Weird", age=36)
+    hero_7 = Hero(name="Captain North America", secret_name="Esteban Rogelios", age=93)
+
+    with Session(engine) as session:
+        session.add(hero_1)
+        session.add(hero_2)
+        session.add(hero_3)
+        session.add(hero_4)
+        session.add(hero_5)
+        session.add(hero_6)
+        session.add(hero_7)
+
+        session.commit()
+
+
+def select_heroes():
+    with Session(engine) as session:
+        statement = select(Hero).where(Hero.age >= 35).where(Hero.age < 40)
+        results = session.exec(statement)
+        for hero in results:
+            print(hero)
+
+
+def main():
+    create_db_and_tables()
+    create_heroes()
+    select_heroes()
+
+
+if __name__ == "__main__":
+    main()