Python

if hasattr(a, 'property'):
    a.property

try:
    doStuff(a.property)
except AttributeError:
    otherStuff()

if hasattr(a, 'property'):
    doStuff(a.property)
else:
    otherStuff()

assert hasattr(a, 'property'), 'object lacks property' 
print(a.property)

getattr(a, 'property', 'default value')

if hasattr(a, 'property'):
    a.property

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