Getting the superclasses for a python object

zope2, zope3, cookbook, Plone

Zope 2 (and Plone) persistent objects usually have an intricate inheritance tree. Finding what classes an object inherits can be a time consuming task, hunting through the various eggs for the relevant source code. Below is a little snippet that shows how to easily get the list of superclasses:

(Pdb) pp type(ff).mro()
(<class 'plone.app.blob.subtypes.image.ExtensionBlobField'>,
 <class 'archetypes.schemaextender.field.TranslatableExtensionField'>,
 <class 'archetypes.schemaextender.field.BaseExtensionField'>,
 <class 'plone.app.blob.field.BlobField'>,
 <class 'Products.Archetypes.Field.ObjectField'>,
 <class 'Products.Archetypes.Field.Field'>,
 <class 'Products.Archetypes.Layer.DefaultLayerContainer'>,
 <class 'plone.app.blob.mixins.ImageFieldMixin'>,
 <class 'Products.Archetypes.Field.ImageField'>,
 <class 'Products.Archetypes.Field.FileField'>,
 <type 'ExtensionClass.Base'>,
 <type 'object'>)

 Credit goes to the original post where I found this.