AttributeError 🐍 Python

AttributeError: 'X' object has no attribute 'y'

You accessed an attribute or method that doesn’t exist on that object type.

Seen on: Python

Meaning

The object is a different type than you think (often None, a str instead of a dict, or a library object whose API changed).

Common causes

  • Object is None ('NoneType' object has no attribute)
  • Wrong type (string vs dict)
  • Library version changed the API
  • Typo in attribute name
  • Module shadowed by a local file

⚡ Quick fix

  1. print(type(obj)) before the line
  2. Check the library version and docs
  3. Guard for None

Detailed fix by platform

Python

  1. Use dir(obj) in a debugger to see available attributes.

How to diagnose

  1. Type — What type is the object really?
  2. Version — API changed?

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