python
from mongoengine import Document, StringField, connect
connect('mydb', host='localhost', port=27017)
class User(Document):
name = StringField(required=True, max_length=50)
age = StringField(required=True)
user = User(name='Alice', age='22')
user.save()
users = User.objects(age__gte=20)
for user in users:
print(user.name, user.age)
