# v1.0 Upgrade Guide

## Deprecations


*  AbstractType is deprecated, please use normal inheritance instead.

  Before:

  ```python
  class CommonFields(AbstractType):
      name = String()
  
  class Pet(CommonFields, Interface):
      pass
  ```

  With 2.0:
  ```python
  class CommonFields(object):
      name = String()
  
  class Pet(CommonFields, Interface):
      pass
  ```