A Pythonic Interface to DynamoDB
Project description
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:
See the full documentation at http://pynamodb.readthedocs.org/
Ask questions at Google group
See release notes at http://pynamodb.readthedocs.org/en/latest/release_notes.html
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)PynamoDB allows you to create the table if needed (it must exist before you can use it!):
UserModel.create_table(read_capacity_units=1, write_capacity_units=1)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)Want to enable streams on a table? Just add a stream_view_type name attribute and specify the type of data you’d like to stream.
from pynamodb.models import Model
from pynamodb.attributes import UnicodeAttribute
from pynamodb.constants import STREAM_NEW_AND_OLD_IMAGE
class AnimalModel(Model):
"""
A DynamoDB Animal
"""
class Meta:
table_name = "dynamodb-user"
host = "http://localhost:8000"
stream_view_type = STREAM_NEW_AND_OLD_IMAGE
type = UnicodeAttribute(null=True)
name = UnicodeAttribute(range_key=True)
id = UnicodeAttribute(hash_key=True)Want to backup and restore a table? No problem.
# Backup the table
UserModel.dump("usermodel_backup.json")
# Restore the table
UserModel.load("usermodel_backup.json")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
Full table backup/restore
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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