Carlos yang

报错如下，已安装jieba ``` Traceback (most recent call last): File "C:\Users\wie\Miniconda3\lib\pkgutil.py", line 415, in get_importer importer = sys.path_importer_cache[path_item] KeyError: None During handling of the above exception, another exception occurred: Traceback (most recent...

when i use codepretiffy ,it tells me that json is not define.

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hi,sir！when i use codepretiffy ,it tells me that json is not define.I don't know how to fix it. [this is the photo](https://github.com/lemonlife2333/data_struct/blob/master/jupyter%20bug.png) And I had installed jupyterthemes,maybe it is the...