Solution from about_proxy_object_project.py https://github.com/gregmalcolm/python_koans

gistfile1.py

## call as:
## Proxy(YourObject())

class Proxy:
    def __init__(self, target_object):
        print("initializing proxy for "+target_object.__class__.__name__)
        self._log = []
        self._obj = target_object

    def __getattr__(self,attr):
        if '_obj' ==  attr:
            raise AttributeError
          
        self._log.append(attr)
        return self._obj.__getattribute__(attr)
    
    def __setattr__(self, name, value):
        if hasattr(self, '_obj'):
            self._log.append(name)
            object.__setattr__(self._obj, name, value)
        else:
            object.__setattr__(self, name, value)

    def messages(self):
        return self._log

    def was_called(self,attr):
        return attr in self._log

    def number_of_times_called(self,attr):
        count_attr = 0
        for item in self._log:
            if item == attr: count_attr += 1
        return count_attr