How to know if an object has an attribute in Python

0 votes

Is there a way in Python to determine if an object has some attribute? For example:

>>> a = SomeClass()
>>> a.someProperty = value
>>> a.property
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: SomeClass instance has no attribute 'property'

How can you tell if a has the attribute property before using it?

Dec 2, 2020 in Python by Roshni
• 10,500 points
106 views

1 answer to this question.

0 votes

Try hasattr():

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

The general practice in python is that, if the property is likely to be there most of the time, simply call it and either let the exception propagate, or trap it with a try/except block. This will likely be faster than hasattr. If the property is likely to not be there most of the time, or you're not sure, using hasattr will probably be faster than repeatedly falling into an exception block

answered Dec 2, 2020 by Gitika
• 65,850 points

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