Question

I know it is easy to implement.

I want a dictionary like class, which takes a list of dictionaries in the constructor.

If you read from this dict by key, the dict-class should check the list of dictionaries and return the first value. If none contains this key KeyError should be thrown like a normal dict.

This dictionary container should be read only for my usage.

Answer 1

You seem to be describing collections.ChainMap, which will be in the next version of Python (3.3, expected to go final later this year). For current/earlier versions of Python, you can copy the implementation from the collections source code.