import sys

class Context:

    def __init__(self):
        self._vars = {}

    def get(self, key, default=None):
        return self._vars.get(key, default)

    def __getitem__(self, key):
        return self._vars[key]

    def __setitem__(self, key, value):
        self._vars[key] = value


class Run:

    def __init__(self):
        self._name = None
        self._context = None

    def get_context(self):
        return self._context

    def start(self, name):
        self._context = Context()
        self._name = name

    def end(self):
        sys.stdout.write('OK: {}\n'.format(self._name))