kedro.io.PartitionedDataSet¶

class kedro.io.PartitionedDataSet(path, dataset, filepath_arg='filepath', filename_suffix='', credentials=None, load_args=None)[source]¶

Bases: kedro.io.core.AbstractDataSet

PartitionedDataSet loads and saves partitioned file-like data using the underlying dataset definition. For filesystem level operations it uses fsspec: https://github.com/intake/filesystem_spec.

Example:

import pandas as pd
from kedro.io import PartitionedDataSet

# these credentials will be passed to both 'fsspec.filesystem()' call
# and the dataset initializer
credentials = {"key1": "secret1", "key2": "secret2"}

data_set = PartitionedDataSet(
    path="s3://bucket-name/path/to/folder",
    dataset="CSVDataSet",
    credentials=credentials
)
loaded = data_set.load()
# assert isinstance(loaded, dict)

combine_all = pd.DataFrame()

for partition_id, partition_load_func in loaded.items():
    partition_data = partition_load_func()
    combine_all = pd.concat(
        [combine_all, partition_data], ignore_index=True, sort=True
    )

new_data = pd.DataFrame({"new": [1, 2]})
# creates "s3://bucket-name/path/to/folder/new/partition.csv"
data_set.save({"new/partition.csv": new_data})

Methods

`PartitionedDataSet.__init__`(path, dataset[, …])	Creates a new instance of `PartitionedDataSet`.
`PartitionedDataSet.exists`()	Checks whether a data set’s output already exists by calling the provided _exists() method.
`PartitionedDataSet.from_config`(name, config)	Create a data set instance using the configuration provided.
`PartitionedDataSet.load`()	Loads data by delegation to the provided load method.
`PartitionedDataSet.release`()	Release any cached data.
`PartitionedDataSet.save`(data)	Saves data by delegation to the provided save method.

__init__(path, dataset, filepath_arg='filepath', filename_suffix='', credentials=None, load_args=None)[source]¶

Creates a new instance of PartitionedDataSet.

Parameters:

path (str) – Path to the folder containing partitioned data. If path starts with the protocol (e.g., s3://) then the corresponding fsspec concrete filesystem implementation will be used. If protocol is not specified, fsspec.implementations.local.LocalFileSystem will be used. Note: Some concrete implementations are bundled with fsspec, while others (like s3 or gcs) must be installed separately prior to usage of the PartitionedDataSet.
dataset (Union[str, Type[AbstractDataSet], Dict[str, Any]]) – Underlying dataset definition. This is used to instantiate the dataset for each file located inside the path. Accepted formats are: a) object of a class that inherits from AbstractDataSet b) a string representing a fully qualified class name to such class c) a dictionary with type key pointing to a string from b), other keys are passed to the Dataset initializer. Credentials for the dataset can be explicitly specified in this configuration.
filepath_arg (str) – Underlying dataset initializer argument that will contain a path to each corresponding partition file. If unspecified, defaults to “filepath”.
filename_suffix (str) – If specified, only partitions that end with this string will be processed.
credentials (Optional[Dict[str, Any]]) – Protocol-specific options that will be passed to fsspec.filesystem https://filesystem-spec.readthedocs.io/en/latest/api.html#fsspec.filesystem and the dataset initializer. If the dataset config contains explicit credentials spec, then such spec will take precedence. Note: dataset_credentials key has now been deprecated and should not be specified. All possible credentials management scenarios are documented here: https://kedro.readthedocs.io/en/stable/04_user_guide/08_advanced_io.html#partitioned-dataset-credentials
load_args (Optional[Dict[str, Any]]) – Keyword arguments to be passed into find() method of the filesystem implementation.

Raises:

DataSetError – If versioning is enabled for the underlying dataset.

exists()¶

Checks whether a data set’s output already exists by calling the provided _exists() method.

Return type:	`bool`
Returns:	Flag indicating whether the output already exists.
Raises:	`DataSetError` – when underlying exists method raises error.

classmethod from_config(name, config, load_version=None, save_version=None)¶

Create a data set instance using the configuration provided.

Parameters:	name (`str`) – Data set name. config (`Dict`[`str`, `Any`]) – Data set config dictionary. load_version (`Optional`[`str`]) – Version string to be used for `load` operation if the data set is versioned. Has no effect on the data set if versioning was not enabled. save_version (`Optional`[`str`]) – Version string to be used for `save` operation if the data set is versioned. Has no effect on the data set if versioning was not enabled.
Return type:	`AbstractDataSet`
Returns:	An instance of an `AbstractDataSet` subclass.
Raises:	`DataSetError` – When the function fails to create the data set from its config.

load()¶

Loads data by delegation to the provided load method.

Return type:	`Any`
Returns:	Data returned by the provided load method.
Raises:	`DataSetError` – When underlying load method raises error.

release()¶

Release any cached data.

Raises:	`DataSetError` – when underlying release method raises error.
Return type:	`None`

save(data)¶

Saves data by delegation to the provided save method.

Parameters:	data (`Any`) – the value to be saved by provided save method.
Raises:	`DataSetError` – when underlying save method raises error.
Return type:	`None`