Python AttributeError: 'collections' has no attribute 'MutableMapping'

This error occurs when you try to access the 'MutableMapping' attribute in the 'collections' module, but it is not defined in your version of Python.

'MutableMapping' is a class that provides a generic interface for working with mutable mappings (e.g., dictionaries) in Python. It was introduced in Python 2.6 and is part of the 'collections' module.

To fix this error, you can either upgrade your Python version to one that includes 'MutableMapping' or use a different class or module that provides similar functionality. Alternatively, you can modify your code to work without using 'MutableMapping'.