App engine - check to see if a property exists within Expando class

What is a good way to check to see if a property is populated in an ex开发者_开发知识库pando class (Python for App Engine)

Can I do:

if Expando_class_name.property_name_to_check:
    do = someStuff

Or is that going to give me an error?

Thanks!

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Use hasattr:

if hasattr(expando_instance, 'foo'):
  # Do something with expando_instance.foo

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A better way is to use the dynamic_properties method.

if 'foo' in entity.dynamic_properties():  pass