在定义Model之后使用syncdb 同步的时候报出这个错误，检查之后发现是用错了。在model的Meta里面，排序这些用的应该是

ordering = ['last','first','middle']

unique_together = ['first','last','middle']

verbose_name_plural = "people"

如果是误写成

ordering = {'last','first','middle'}
        unique_together = {'first','last','middle'}
        verbose_name_plural = "people"

会出现 'set' object does not support indexing

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