Source code for pytablewriter.writer.binary._pandas

from typing import Optional

import tabledata

from ...error import EmptyValueError
from ._interface import AbstractBinaryTableWriter


[docs]class PandasDataFramePickleWriter(AbstractBinaryTableWriter): """ A table writer class for pandas DataFrame pickle. .. py:method:: write_table() Write a table to a pandas DataFrame pickle file. """ FORMAT_NAME = "pandas_pickle" @property def format_name(self) -> str: return self.FORMAT_NAME @property def support_split_write(self) -> bool: return False def __init__(self, **kwargs) -> None: import copy import dataproperty super().__init__(**kwargs) self.is_padding = False self.is_formatting_float = False self._use_default_header = True self._quoting_flags = copy.deepcopy(dataproperty.NOT_QUOTING_FLAGS) self.__filepath: Optional[str] = None def is_opened(self) -> bool: return self.__filepath is not None
[docs] def open(self, file_path: str) -> None: self.__filepath = file_path
[docs] def close(self) -> None: super().close() self.__filepath = None
[docs] def dump(self, output: str, close_after_write: bool = True, **kwargs) -> None: """Write data to a DataFrame pickle file. Args: output (file descriptor or filepath): """ self.open(output) try: self.write_table(**kwargs) finally: if close_after_write: self.close()
def _verify_stream(self) -> None: pass def _write_table(self, **kwargs) -> None: if not self.is_opened(): self._logger.logger.error("required to open(file_path) first.") return try: self._verify_value_matrix() except EmptyValueError: self._logger.logger.debug("no tabular data found") return self._preprocess() table_data = tabledata.TableData( self.table_name, self.headers, [ [value_dp.data for value_dp in value_dp_list] for value_dp_list in self._table_value_dp_matrix ], type_hints=self.type_hints, max_workers=self.max_workers, ) table_data.as_dataframe().to_pickle(self.__filepath) def _write_table_iter(self, **kwargs) -> None: self._write_table(**kwargs)