$ pip install https://github.com/sxnol/dynamodb2-mapper/archive/master.zip

$ export AWS_ACCESS_KEY_ID=<your id key here>
$ export AWS_SECRET_ACCESS_KEY=<your secret key here>

from random import random
from dynamodb2_mapper.model import DynamoDB2Model
from dynamodb2_mapper.types import STRING, NUMBER, DECIMAL
from passlib.apps import custom_app_context as pwd_context

class User(DynamoDB2Model):
    __tablename__ = 'users'
    username = Attribute(STRING, hash_key=True, unique=True)
    password = Attribute(STRING, nullable=False, on_save=pwd_context.encrypt, verify=lambda x,y: pwd_context.verify(y,x))
    rank = Attribute(DECIMAL, on_save=lambda x: x+0.1, default=random)
    register_timestamp = Attribute(TIMESTAMP, default=time(), indexed=True)

from dynamodb2_mapper.connection import DynamoDB2Connection

conn = DynamoDB2Connection()
conn.create_table(User, 10, 10, wait_for_active=True)

import datetime
from yourapp.models import User

new_user = User()
new_user.username = u"john_doe"
new_user.password = u"secret"
new_user.save()


# Later on, retrieve that same object from the DB...
existing_user = User(username=u"john_doe")
existing_user = User(username__eq=u"john_doe")
# or simply
existing_user = User(u"john_doe")

# rank will be increased by 0.1 and password will be hashed with new random salt
existing_user.save() 

# create custom methods which will take first argument as attribute's value
existing_user.verify(u"secret")
True

existing_user.verify(u"baby")
False

# get users registered in last 10 days
ten_days_ago = datetime.date.today() - datetime.timedelta(10)
timestamp = ten_days_ago.strftime("%s")
users_registered_in_last_ten_days = User().query(register_timestamp__gt=timestamp)