def __init__(self, message):
        "ValidationError can be passed a string or a list."
        if isinstance(message, list):
            self.messages = message
        else:
            assert isinstance(message, (basestring, Promise)), (message % "'%s' should be a string")
            self.messages = [message]
dataset/ETHPy150Open CollabQ/CollabQ/.google_appengine/lib/django/django/core/validators.py/CriticalValidationError.__init__/swapped operands of `%`