def __init__(self, message):
        if isinstance(message, list):
            self.messages = message
        else:
            assert isinstance(message, (basestring, Promise)), ("%s should be a string" % repr(message))
            self.messages = [message]
perform month->code and back conversion
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-0.96/django/core/validators.py/ValidationError.__init__--crossover with--dataset/ETHPy150Open sjev/trading-with-python/lib/cboe.py/monthCode