def __init__(self, data):
        """Exception raised on missing schema key.

        :param data: data dict that was checked.
        """
        message = 'Unable to find "$schema" key in "{}".'.format(data)
        super(SchemaKeyNotFound, self).__init__(message)
def __init__ ( self , data ) : message = 'Unable to find "$schema" key in "{}".' . format ( data ) super ( SchemaKeyNotFound , self ) . __init__ ( message )
Exception raised on missing schema key.

        :param data: data dict that was checked.