python
from mongoengine import Document, StringField, IntField
class User(Document):
name = StringField(required=True)
age = IntField()
user = User(name="John Doe", age=25)
user.save()
users = User.objects(age__gt=20)
for user in users:
print(user.name, user.age)
user = User.objects(name="John Doe").first()
user.age = 30
user.save()
user = User.objects(name="John Doe").first()
user.delete()
