How to check if an object has an attribute?
attributeerror, attributes, class, object, python
Solution
Try `hasattr()`:
if hasattr(a, 'property'):
a.property
See zweiterlinde's answer below, who offers good advice about asking forgiveness! A very pythonic approach!
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.
Problem
How do I check if an object has some attribute? For example: ``` >>> a = SomeClass() >>> a.property Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: SomeClass instance has no attribute 'property' ``` How do I tell if `a` has the attribute `property` before using it?