Ask a Question

How to check existence of an attribute in an object in python?

+1 vote
1,051 views
asked Jul 31, 2017 by Hitesh Garg (355 points)  
edited Aug 10, 2017 by Hitesh Garg

I have to determine whether some object has an attribute or not. I am working on a jira application to perform some tasks and when I get the information of the worklog author name it gives below mentioned error in some cases.

worklog.author.displayName
type object 'PropertyHolder' has no attribute 'displayName'

How to check if the workplog.author has displayName property or not?

1 Answer

+1 vote
answered Aug 10, 2017 by Rahul Singh (553 points)  
selected Aug 10, 2017 by Hitesh Garg
 
Best answer

hasattr is a method used for checking the existence of an attribute in an object.

Example - 

if hasattr(objRef, 'propName'):
    objRef.propName

You can simply use the code below to check the existence of attribute 'displayname' and if it doesn't exists then use value of name as there is always a name attribute with this field you have mentioned in the question.

display_name = worklog.author.displayName if hasattr(worklog.author, "displayName") else worklog.author.name
...