TypeError: can only concatenate str (not "SingleProductSoldModel") to str

回答: 这个错误是因为在代码中尝试将一个字符串类型和一个"SingleProductSoldModel"类型的变量进行拼接，而拼接操作只能在两个字符串类型之间进行。\[1\]所以出现了TypeError: can only concatenate str (not "SingleProductSoldModel") to str的错误提示。解决这个问题的方法有两种，一种是删除掉字符类型的打印内容，另一种是将"SingleProductSoldModel"类型的变量转换成字符串类型。\[3\]
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