def random_string(self, length=255, extra_chars=''):
        chars = string.ascii_letters + extra_chars
        return ''.join([random.choice(chars) for i in range(length)])
Adds static-related context variables to the context.
dataset/ETHPy150Open rapidsms/rapidsms/rapidsms/tests/harness/base.py/CreateDataMixin.random_string--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.5/django/core/context_processors.py/static