如何解决 TypeError: can only concatenate list (not "str") to list

Question

我有一个这样的代码示例：

    def run_prediction(self, min_len=5):
        predict_list = []
        desire_list = []
        desire_name = []
        for text, label, pos in zip(self.dataframe.text, self.dataframe.label, self.dataframe.pos):
            tokenized = hazm.word_tokenize(text)
            pos = pos.strip().split()
            if len(tokenized) < min_len:
                tokenized = tokenized + "<pad>" * (min_len - len(tokenized))
                pos = pos + "<pad>" * (min_len - len(tokenized))

tokenized 和 pos 是列表，问题出在 。

而且我有错误：

                tokenized = tokenized + "<pad>" * (min_len - len(tokenized))
                pos = pos + "<pad>" * (min_len - len(tokenized))```
the bug is :
**TypeError: can only concatenate list (not "str") to list**


  
how can I solve this in best way?