pandas.HDFStore.append¶

HDFStore.append(self, key: str, value: ~FrameOrSeries, format=None, axes=None, index=True, append=True, complib=None, complevel: Union[int, NoneType] = None, columns=None, min_itemsize: Union[int, Dict[str, int], NoneType] = None, nan_rep=None, chunksize=None, expectedrows=None, dropna: Union[bool, NoneType] = None, data_columns: Union[List[str], NoneType] = None, encoding=None, errors: str = 'strict')[source]¶

Append to Table in file. Node must already exist and be Table format.

Parameters

keystr

value{Series, DataFrame}

format‘table’ is the default

table(t)table format: Write as a PyTables Table structure which may perform worse but allow more flexible operations like searching / selecting subsets of the data.

appendbool, default True

Append the input data to the existing.

data_columnslist of columns, or True, default None

List of columns to create as indexed data columns for on-disk queries, or True to use all columns. By default only the axes of the object are indexed. See here.

min_itemsizedict of columns that specify minimum string sizes

nan_repstring to use as string nan representation

chunksizesize to chunk the writing

expectedrowsexpected TOTAL row size of this table

encodingdefault None, provide an encoding for strings

dropnabool, default False

Do not write an ALL nan row to the store settable by the option ‘io.hdf.dropna_table’.

Notes

Does not check if data being appended overlaps with existing data in the table, so be careful