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# pandas.HDFStore.append

`HDFStore.``append`(key, value, format=None, append=True, columns=None, dropna=None, **kwargs)

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

  Parameters : | key : object value : {Series, DataFrame, Panel, Panel4D} 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 append : boolean, default True, append the input data to the existing data_columns : list of columns to create as data columns, or True to use all columns min_itemsize : dict of columns that specify minimum string sizes nan_rep : string to use as string nan represenation chunksize : size to chunk the writing expectedrows : expected TOTAL row size of this table encoding : default None, provide an encoding for strings dropna : boolean, default True, 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

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