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python Programming Glossary: min_itemsizeHow to trouble-shoot HDFStore Exception: cannot find the correct atom type http://stackoverflow.com/questions/15488809/how-to-trouble-shoot-hdfstore-exception-cannot-find-the-correct-atom-type Index fiB aseModel dtype object fiBaseModel column has a min_itemsize of 13 but it emsize 9 is required I think I know what's going.. each chunk into the HDFStore passing a large value for min_itemsize . I get the following exception AttributeError 'NoneType' object.. chunksize 10000 na_filter False store.append 'df' chunk min_itemsize 200 I've tried to debug and inspected the items in the stack..
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