O cheque arquivado existe no objeto Python
if hasattr(a, 'property'):
a.property
Troubled Teira
if hasattr(a, 'property'):
a.property>>> class A(object):
... foo = 1
...
>>> class B(A):
... pass
...
>>> b = B()
>>> hasattr(b, 'foo')
True
>>> 'foo' in b.__dict__
False