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A Pythonic Interface to DynamoDB

Project Description

Latest Version https://travis-ci.org/jlafon/PynamoDB.png?branch=devel https://coveralls.io/repos/jlafon/PynamoDB/badge.png?branch=devel https://pypip.in/wheel/pynamodb/badge.png https://pypip.in/license/pynamodb/badge.png

A Pythonic interface for Amazon’s DynamoDB that supports Python 2 and 3.

DynamoDB is a great NoSQL service provided by Amazon, but the API is verbose. PynamoDB presents you with a simple, elegant API.

Useful links:

Installation

From PyPi:

$ pip install pynamodb

From GitHub:

$ pip install git+https://github.com/jlafon/PynamoDB#egg=pynamodb

Basic Usage

Create a model that describes your DynamoDB table.

from pynamodb.models import Model
from pynamodb.attributes import UnicodeAttribute

class UserModel(Model):
    """
    A DynamoDB User
    """
    class Meta:
        table_name = "dynamodb-user"
    email = UnicodeAttribute(null=True)
    first_name = UnicodeAttribute(range_key=True)
    last_name = UnicodeAttribute(hash_key=True)

Now, search your table for all users with a last name of ‘Smith’ and whose first name begins with ‘J’:

for user in UserModel.query("Smith", first_name__begins_with="J"):
    print(user.first_name)

Create a new user:

user = UserModel("John", "Denver")
user.save()

Retrieve an existing user:

try:
    user = UserModel.get("John", "Denver")
    print(user)
except UserModel.DoesNotExist:
    print("User does not exist")

Advanced Usage

Want to use indexes? No problem:

from pynamodb.models import Model
from pynamodb.indexes import GlobalSecondaryIndex, AllProjection
from pynamodb.attributes import NumberAttribute, UnicodeAttribute

class ViewIndex(GlobalSecondaryIndex):
    class Meta:
        read_capacity_units = 2
        write_capacity_units = 1
        projection = AllProjection()
    view = NumberAttribute(default=0, hash_key=True)

class TestModel(Model):
    class Meta:
        table_name = "TestModel"
    forum = UnicodeAttribute(hash_key=True)
    thread = UnicodeAttribute(range_key=True)
    view = NumberAttribute(default=0)
    view_index = ViewIndex()

Now query the index for all items with 0 views:

for item in TestModel.view_index.query(0):
    print("Item queried from index: {0}".format(item))

It’s really that simple.

Want to use DynamoDB local? Just add a host name attribute and specify your local server.

from pynamodb.models import Model
from pynamodb.attributes import UnicodeAttribute

class UserModel(Model):
    """
    A DynamoDB User
    """
    class Meta:
        table_name = "dynamodb-user"
        host = "http://localhost:8000"
    email = UnicodeAttribute(null=True)
    first_name = UnicodeAttribute(range_key=True)
    last_name = UnicodeAttribute(hash_key=True)

Features

  • Python 3.3, 3.4, 2.6, and 2.7 support
  • An ORM-like interface with query and scan filters
  • Compatible with DynamoDB Local
  • Supports the entire DynamoDB API
  • Support for Unicode, Binary, JSON, Number, Set, and UTC Datetime attributes
  • Support for Global and Local Secondary Indexes
  • Provides iterators for working with queries, scans, that are automatically paginated
  • Automatic pagination for bulk operations
  • Complex queries
  • Support for Global and Local Secondary Indexes
  • Batch operations with automatic pagination
  • Iterators for working with Query and Scan operations

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Filename, size & hash SHA256 hash help File type Python version Upload date
pynamodb-1.2.0-py2.py3-none-any.whl (45.2 kB) Copy SHA256 hash SHA256 Wheel 3.3 May 6, 2014
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