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# Table of Contents | ||
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* [dlt/pipeline](#dlt/pipeline) | ||
* [pipeline](#dlt/pipeline.pipeline) | ||
* [pipeline](#dlt/pipeline.pipeline) | ||
* [pipeline](#dlt/pipeline.pipeline) | ||
* [attach](#dlt/pipeline.attach) | ||
* [run](#dlt/pipeline.run) | ||
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<a id="dlt/pipeline"></a> | ||
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# dlt/pipeline | ||
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<a id="dlt/pipeline.pipeline"></a> | ||
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#### pipeline | ||
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```python | ||
@overload | ||
def pipeline(pipeline_name: str = None, | ||
pipelines_dir: str = None, | ||
pipeline_salt: TSecretValue = None, | ||
destination: TDestinationReferenceArg = None, | ||
staging: TDestinationReferenceArg = None, | ||
dataset_name: str = None, | ||
import_schema_path: str = None, | ||
export_schema_path: str = None, | ||
full_refresh: bool = False, | ||
credentials: Any = None, | ||
progress: TCollectorArg = _NULL_COLLECTOR) -> Pipeline | ||
``` | ||
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Creates a new instance of `dlt` pipeline, which moves the data from the source ie. a REST API to a destination ie. database or a data lake. | ||
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Summary | ||
The `pipeline` functions allows you to pass the destination name to which the data should be loaded, the name of the dataset and several other options that govern loading of the data. | ||
The created `Pipeline` object lets you load the data from any source with `run` method or to have more granular control over the loading process with `extract`, `normalize` and `load` methods. | ||
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Please refer to the following doc pages | ||
- Write your first pipeline walkthrough: https://dlthub.com/docs/walkthroughs/create-a-pipeline | ||
- Pipeline architecture and data loading steps: https://dlthub.com/docs/reference | ||
- List of supported destinations: https://dlthub.com/docs/dlt-ecosystem/destinations | ||
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**Arguments**: | ||
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- `pipeline_name` _str, optional_ - A name of the pipeline that will be used to identify it in monitoring events and to restore its state and data schemas on subsequent runs. | ||
Defaults to the file name of pipeline script with `dlt_` prefix added. | ||
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- `pipelines_dir` _str, optional_ - A working directory in which pipeline state and temporary files will be stored. Defaults to user home directory: `~/dlt/pipelines/`. | ||
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- `pipeline_salt` _TSecretValue, optional_ - A random value used for deterministic hashing during data anonymization. Defaults to a value derived from the pipeline name. | ||
Default value should not be used for any cryptographic purposes. | ||
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- `destination` _str | DestinationReference, optional_ - A name of the destination to which dlt will load the data, or a destination module imported from `dlt.destination`. | ||
May also be provided to `run` method of the `pipeline`. | ||
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- `staging` _str | DestinationReference, optional_ - A name of the destination where dlt will stage the data before final loading, or a destination module imported from `dlt.destination`. | ||
May also be provided to `run` method of the `pipeline`. | ||
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- `dataset_name` _str, optional_ - A name of the dataset to which the data will be loaded. A dataset is a logical group of tables ie. `schema` in relational databases or folder grouping many files. | ||
May also be provided later to the `run` or `load` methods of the `Pipeline`. If not provided at all then defaults to the `pipeline_name` | ||
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- `import_schema_path` _str, optional_ - A path from which the schema `yaml` file will be imported on each pipeline run. Defaults to None which disables importing. | ||
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- `export_schema_path` _str, optional_ - A path where the schema `yaml` file will be exported after every schema change. Defaults to None which disables exporting. | ||
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- `full_refresh` _bool, optional_ - When set to True, each instance of the pipeline with the `pipeline_name` starts from scratch when run and loads the data to a separate dataset. | ||
The datasets are identified by `dataset_name_` + datetime suffix. Use this setting whenever you experiment with your data to be sure you start fresh on each run. Defaults to False. | ||
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- `credentials` _Any, optional_ - Credentials for the `destination` ie. database connection string or a dictionary with google cloud credentials. | ||
In most cases should be set to None, which lets `dlt` to use `secrets.toml` or environment variables to infer right credentials values. | ||
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progress(str, Collector): A progress monitor that shows progress bars, console or log messages with current information on sources, resources, data items etc. processed in | ||
`extract`, `normalize` and `load` stage. Pass a string with a collector name or configure your own by choosing from `dlt.progress` module. | ||
We support most of the progress libraries: try passing `tqdm`, `enlighten` or `alive_progress` or `log` to write to console/log. | ||
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**Returns**: | ||
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- `Pipeline` - An instance of `Pipeline` class with. Please check the documentation of `run` method for information on what to do with it. | ||
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<a id="dlt/pipeline.pipeline"></a> | ||
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#### pipeline | ||
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```python | ||
@overload | ||
def pipeline() -> Pipeline | ||
``` | ||
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When called without any arguments, returns the recently created `Pipeline` instance. | ||
If not found, it creates a new instance with all the pipeline options set to defaults. | ||
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<a id="dlt/pipeline.pipeline"></a> | ||
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#### pipeline | ||
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```python | ||
@with_config(spec=PipelineConfiguration, auto_pipeline_section=True) | ||
def pipeline(pipeline_name: str = None, | ||
pipelines_dir: str = None, | ||
pipeline_salt: TSecretValue = None, | ||
destination: TDestinationReferenceArg = None, | ||
staging: TDestinationReferenceArg = None, | ||
dataset_name: str = None, | ||
import_schema_path: str = None, | ||
export_schema_path: str = None, | ||
full_refresh: bool = False, | ||
credentials: Any = None, | ||
progress: TCollectorArg = _NULL_COLLECTOR, | ||
**kwargs: Any) -> Pipeline | ||
``` | ||
|
||
Creates a new instance of `dlt` pipeline, which moves the data from the source ie. a REST API to a destination ie. database or a data lake. | ||
|
||
Summary | ||
The `pipeline` functions allows you to pass the destination name to which the data should be loaded, the name of the dataset and several other options that govern loading of the data. | ||
The created `Pipeline` object lets you load the data from any source with `run` method or to have more granular control over the loading process with `extract`, `normalize` and `load` methods. | ||
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||
Please refer to the following doc pages | ||
- Write your first pipeline walkthrough: https://dlthub.com/docs/walkthroughs/create-a-pipeline | ||
- Pipeline architecture and data loading steps: https://dlthub.com/docs/reference | ||
- List of supported destinations: https://dlthub.com/docs/dlt-ecosystem/destinations | ||
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**Arguments**: | ||
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- `pipeline_name` _str, optional_ - A name of the pipeline that will be used to identify it in monitoring events and to restore its state and data schemas on subsequent runs. | ||
Defaults to the file name of pipeline script with `dlt_` prefix added. | ||
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- `pipelines_dir` _str, optional_ - A working directory in which pipeline state and temporary files will be stored. Defaults to user home directory: `~/dlt/pipelines/`. | ||
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- `pipeline_salt` _TSecretValue, optional_ - A random value used for deterministic hashing during data anonymization. Defaults to a value derived from the pipeline name. | ||
Default value should not be used for any cryptographic purposes. | ||
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- `destination` _str | DestinationReference, optional_ - A name of the destination to which dlt will load the data, or a destination module imported from `dlt.destination`. | ||
May also be provided to `run` method of the `pipeline`. | ||
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- `staging` _str | DestinationReference, optional_ - A name of the destination where dlt will stage the data before final loading, or a destination module imported from `dlt.destination`. | ||
May also be provided to `run` method of the `pipeline`. | ||
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- `dataset_name` _str, optional_ - A name of the dataset to which the data will be loaded. A dataset is a logical group of tables ie. `schema` in relational databases or folder grouping many files. | ||
May also be provided later to the `run` or `load` methods of the `Pipeline`. If not provided at all then defaults to the `pipeline_name` | ||
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- `import_schema_path` _str, optional_ - A path from which the schema `yaml` file will be imported on each pipeline run. Defaults to None which disables importing. | ||
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- `export_schema_path` _str, optional_ - A path where the schema `yaml` file will be exported after every schema change. Defaults to None which disables exporting. | ||
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- `full_refresh` _bool, optional_ - When set to True, each instance of the pipeline with the `pipeline_name` starts from scratch when run and loads the data to a separate dataset. | ||
The datasets are identified by `dataset_name_` + datetime suffix. Use this setting whenever you experiment with your data to be sure you start fresh on each run. Defaults to False. | ||
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- `credentials` _Any, optional_ - Credentials for the `destination` ie. database connection string or a dictionary with google cloud credentials. | ||
In most cases should be set to None, which lets `dlt` to use `secrets.toml` or environment variables to infer right credentials values. | ||
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progress(str, Collector): A progress monitor that shows progress bars, console or log messages with current information on sources, resources, data items etc. processed in | ||
`extract`, `normalize` and `load` stage. Pass a string with a collector name or configure your own by choosing from `dlt.progress` module. | ||
We support most of the progress libraries: try passing `tqdm`, `enlighten` or `alive_progress` or `log` to write to console/log. | ||
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**Returns**: | ||
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- `Pipeline` - An instance of `Pipeline` class with. Please check the documentation of `run` method for information on what to do with it. | ||
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<a id="dlt/pipeline.attach"></a> | ||
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#### attach | ||
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```python | ||
@with_config(spec=PipelineConfiguration, auto_pipeline_section=True) | ||
def attach(pipeline_name: str = None, | ||
pipelines_dir: str = None, | ||
pipeline_salt: TSecretValue = None, | ||
full_refresh: bool = False, | ||
credentials: Any = None, | ||
progress: TCollectorArg = _NULL_COLLECTOR, | ||
**kwargs: Any) -> Pipeline | ||
``` | ||
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Attaches to the working folder of `pipeline_name` in `pipelines_dir` or in default directory. Requires that valid pipeline state exists in working folder. | ||
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<a id="dlt/pipeline.run"></a> | ||
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#### run | ||
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```python | ||
def run(data: Any, | ||
*, | ||
destination: TDestinationReferenceArg = None, | ||
staging: TDestinationReferenceArg = None, | ||
dataset_name: str = None, | ||
credentials: Any = None, | ||
table_name: str = None, | ||
write_disposition: TWriteDisposition = None, | ||
columns: Sequence[TColumnSchema] = None, | ||
schema: Schema = None) -> LoadInfo | ||
``` | ||
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Loads the data in `data` argument into the destination specified in `destination` and dataset specified in `dataset_name`. | ||
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Summary | ||
This method will `extract` the data from the `data` argument, infer the schema, `normalize` the data into a load package (ie. jsonl or PARQUET files representing tables) and then `load` such packages into the `destination`. | ||
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The data may be supplied in several forms: | ||
* a `list` or `Iterable` of any JSON-serializable objects ie. `dlt.run([1, 2, 3], table_name="numbers")` | ||
* any `Iterator` or a function that yield (`Generator`) ie. `dlt.run(range(1, 10), table_name="range")` | ||
* a function or a list of functions decorated with @dlt.resource ie. `dlt.run([chess_players(title="GM"), chess_games()])` | ||
* a function or a list of functions decorated with @dlt.source. | ||
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Please note that `dlt` deals with `bytes`, `datetime`, `decimal` and `uuid` objects so you are free to load binary data or documents containing dates. | ||
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Execution | ||
The `run` method will first use `sync_destination` method to synchronize pipeline state and schemas with the destination. You can disable this behavior with `restore_from_destination` configuration option. | ||
Next it will make sure that data from the previous is fully processed. If not, `run` method normalizes and loads pending data items. | ||
Only then the new data from `data` argument is extracted, normalized and loaded. | ||
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**Arguments**: | ||
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- `data` _Any_ - Data to be loaded to destination | ||
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- `destination` _str | DestinationReference, optional_ - A name of the destination to which dlt will load the data, or a destination module imported from `dlt.destination`. | ||
If not provided, the value passed to `dlt.pipeline` will be used. | ||
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dataset_name (str, optional):A name of the dataset to which the data will be loaded. A dataset is a logical group of tables ie. `schema` in relational databases or folder grouping many files. | ||
If not provided, the value passed to `dlt.pipeline` will be used. If not provided at all then defaults to the `pipeline_name` | ||
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- `credentials` _Any, optional_ - Credentials for the `destination` ie. database connection string or a dictionary with google cloud credentials. | ||
In most cases should be set to None, which lets `dlt` to use `secrets.toml` or environment variables to infer right credentials values. | ||
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- `table_name` _str, optional_ - The name of the table to which the data should be loaded within the `dataset`. This argument is required for a `data` that is a list/Iterable or Iterator without `__name__` attribute. | ||
The behavior of this argument depends on the type of the `data`: | ||
* generator functions: the function name is used as table name, `table_name` overrides this default | ||
* `@dlt.resource`: resource contains the full table schema and that includes the table name. `table_name` will override this property. Use with care! | ||
* `@dlt.source`: source contains several resources each with a table schema. `table_name` will override all table names within the source and load the data into single table. | ||
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- `write_disposition` _Literal["skip", "append", "replace", "merge"], optional_ - Controls how to write data to a table. `append` will always add new data at the end of the table. `replace` will replace existing data with new data. `skip` will prevent data from loading. "merge" will deduplicate and merge data based on "primary_key" and "merge_key" hints. Defaults to "append". | ||
Please note that in case of `dlt.resource` the table schema value will be overwritten and in case of `dlt.source`, the values in all resources will be overwritten. | ||
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- `columns` _Sequence[TColumnSchema], optional_ - A list of column schemas. Typed dictionary describing column names, data types, write disposition and performance hints that gives you full control over the created table schema. | ||
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- `schema` _Schema, optional_ - An explicit `Schema` object in which all table schemas will be grouped. By default `dlt` takes the schema from the source (if passed in `data` argument) or creates a default one itself. | ||
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**Raises**: | ||
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PipelineStepFailed when a problem happened during `extract`, `normalize` or `load` steps. | ||
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**Returns**: | ||
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- `LoadInfo` - Information on loaded data including the list of package ids and failed job statuses. Please not that `dlt` will not raise if a single job terminally fails. Such information is provided via LoadInfo. | ||
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