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"""``TextLocalDataSet`` loads and saves data to a local text file. The data is
accessed text data using the python open function.
"""
import copy
import os
from pathlib import Path
from typing import Any, Dict
from kedro.io.core import AbstractVersionedDataSet, Version
[docs]class TextLocalDataSet(AbstractVersionedDataSet):
"""``TextLocalDataSet`` loads and saves unstructured text files.
Example:
::
>>> from kedro.io import TextLocalDataSet
>>>
>>> string_to_write = "This will go in a file."
>>>
>>> data_set = TextLocalDataSet(filepath="docs/new_documentation.md")
>>> data_set.save(string_to_write)
>>> reloaded = data_set.load()
"""
DEFAULT_LOAD_ARGS = {"mode": "r"} # type: Dict[str, Any]
DEFAULT_SAVE_ARGS = {"mode": "w"} # type: Dict[str, Any]
[docs] def __init__(
self,
filepath: str,
load_args: Dict[str, Any] = None,
save_args: Dict[str, Any] = None,
version: Version = None,
) -> None:
"""Creates a new instance of ``TextFile``.
Args:
filepath: path to a text file.
load_args: Load arguments should be specified in accordance with
the built in open function. This can be found at
https://docs.python.org/3/library/functions.html#open
save_args: Save arguments should be specified in accordance with
the built in open function. This can be found at
https://docs.python.org/3/library/functions.html#open
version: If specified, should be an instance of
``kedro.io.core.Version``. If its ``load`` attribute is
None, the latest version will be loaded. If its ``save``
attribute is None, save version will be autogenerated.
"""
super().__init__(Path(os.path.expanduser(filepath)), version)
# Handle default load and save arguments
self._load_args = copy.deepcopy(self.DEFAULT_LOAD_ARGS)
if load_args is not None:
self._load_args.update(load_args)
self._save_args = copy.deepcopy(self.DEFAULT_SAVE_ARGS)
if save_args is not None:
self._save_args.update(save_args)
def _load(self) -> str:
load_path = Path(self._get_load_path())
with load_path.open(**self._load_args) as _file:
return _file.read()
def _save(self, data: str) -> None:
save_path = Path(self._get_save_path())
save_path.parent.mkdir(parents=True, exist_ok=True)
with save_path.open(**self._save_args) as _file:
_file.write(data)
def _exists(self) -> bool:
path = self._get_load_path()
return Path(path).is_file()
def _describe(self) -> Dict[str, Any]:
return dict(
filepath=self._filepath,
load_args=self._load_args,
save_args=self._save_args,
version=self._version,
)