AttributeError is an exception that occurs when an attribute reference or assignment fails. This can occur when an attempt is made to reference an attribute on a value that does not support the attribute.
What Causes AttributeError
AttributeError is raised when an invalid attribute reference is made. This can happen if an attribute or function not associated with a data type is referenced on it. For example, if a method is called on an integer value, an
AttributeError is raised.
Python AttributeError Example
Here’s an example of a Python
AttributeError raised when trying call a method on an integer:
i = 1 i.append(2)
In the above example, a method is attempted to be called on an integer. Since integers in Python do not support any methods, running the above code raises a
Traceback (most recent call last): File "test.py", line 2, in <module> i.append(2) AttributeError: 'int' object has no attribute 'append'
How to Fix AttributeError in Python
To avoid the
AttributeError in Python code, a check should be performed before referencing an attribute on an object to ensure that it exists. The Python
help() function can be used to find out all attributes and methods related to the object.
To resolve the
AttributeError, a try-except block can be used. The lines of code that can throw the
AttributeError should be placed in the
try block, and the
except block can catch and handle the error.
Using the above approach, the previous example can be updated to handle the error:
i = 1 try: i.append(2) except AttributeError: print('No such attribute')>
Here, a check is performed for the
AttributeError using the try-except block. When the above code is executed, the
except block catches the
AttributeError and handles it, producing the following output:
No such attribute
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