pandas.dataframe 转换（笔记）

to_dict 或者to_json orient 设置：（用于存入mongodb文档）

orient : str {‘dict’, ‘list’, ‘series’, ‘split’, ‘records’, ‘index’}

Determines the type of the values of the dictionary.

• dict (default) : dict like {column -> {index -> value}}

• list : dict like {column -> [values]}

• series : dict like {column -> Series(values)}

• split : dict like {index -> [index], columns -> [columns], data -> [values]}

• records : list like [{column -> value}, … , {column -> value}]

• index : dict like {index -> {column -> value}}

  New in version 0.17.0.

Abbreviations are allowed. s indicates series and sp indicates split.