please check this link
http://www.odata.org/libraries/
ODataPy (Python)
ODataPy is an open-source Python library that implements the Open Data Protocol (OData). It supports the OData protocol version 4.0. It is built on top of ODataCpp using language binding. It is under development and currently serves only parts of client and client side proxy generation (code gen) aspects of OData.
V4 Client GitHub
ODataStore for CoreData (iOS)
The ODataStore for CoreData is an iOS static library and a Mac OS X Framework to use V3 OData services with the CoreData Framework from Apple. V4 OData services will be supported in the future. The development language is Objective-C.
V3 Both Link
Pyslet Python Package (Python)
Pyslet is a Python package for Standards in Learning Education and Training. It implements a number of standards including OData v2 with both client and server capabilities.
V2 Both Link
OData4ObjC
This library makes it easy for iOS app developers to interact with data in any OData-compliant web service. It supports metadata-aware client-side code generation and full CRUD with query. If someone exposes a data model via OData, OData4ObjC makes it easy to get that model onto your iOS device.
V1-3 Client GitHub