Dependencies¶

Both pip install kedro and conda install -c conda-forge kedro install the core Kedro module, which includes the CLI tool, project template, pipeline abstraction, framework, and support for configuration.

When you create a project, you then introduce additional dependencies for the tasks it performs.

Declare project-specific dependencies¶

When you create a new Kedro project, Kedro generates a requirements.txt file in the root directory of the project. The file contains the core dependencies and those related to the tools you choose to include in the project. Specifying the project's exact dependencies in a requirements.txt file makes it easier to run the project in the future, and avoids version conflicts downstream.

Install project-specific dependencies¶

When someone clones your project, they can install the project-specific dependencies by navigating to the root directory of the project and running the following command:

pip install -r requirements.txt

The Data Catalog is your way of interacting with different data types in Kedro. You can use kedro-datasets to interact with the data used in your projects. Depending on the datasets that you use in your Data Catalog, you might need to include additional dependencies in your requirements.txt. The modular dependencies in this category include pandas, numpy, pyspark, matplotlib, pillow, dask, and more.

Install dependencies at a group-level¶

Data types are broken into groups e.g. pandas, spark and pickle. Each group has a collection of data types e.g.pandas.CSVDataset, pandas.ParquetDataset and more. You can install dependencies for an entire group of dependencies as follows:

pip install "kedro-datasets[<group>]"

This installs Kedro and dependencies related to the data type group. An example of this could be a workflow that depends on the data types in pandas. Run pip install "kedro-datasets[pandas]" to install Kedro and the dependencies for the data types in the pandas group.

Install dependencies at a type-level¶

To limit installation to dependencies specific to a data type:

pip install "kedro-datasets[<group>-<dataset>]"

For example, your workflow might require the pandas.ExcelDataset, so to install its dependencies, run pip install "kedro-datasets[pandas-exceldataset]".

Note

From kedro-datasets version 3.0.0 onwards, the names of the optional dataset-level dependencies have been normalised to follow PEP 685. The '.' character has been replaced with a '-' character and the names are in lowercase. For example, if you had kedro-datasets[pandas.ExcelDataset] in your requirements file, it would have to be changed to kedro-datasets[pandas-exceldataset].

Reproducible environments¶

To ensure that the project dependencies and the transitive dependencies are pinned to specific versions, use pip-tools to compile requirements.txt file into a requirements.lock file. To install pip-tools in your virtual environment, run the following command:

pip install pip-tools

To add or remove dependencies to a project, edit the requirements.txt file, then run the following:

pip-compile <project_root>/requirements.txt --output-file <project_root>/requirements.lock

This will pip compile the requirements listed in the requirements.txt file into a requirements.lock that specifies a list of pinned project dependencies(those with a strict version). You can also use this command with additional CLI arguments such as --generate-hashes to use pip's Hash Checking Mode or --upgrade-package to update specific packages to the latest or specific versions. Check out the pip-tools documentation for more information.

Note

The requirements.txt file contains "source" requirements, while requirements.lock contains the compiled version of those and requires no manual updates. If you need to update the dependencies, update the requirements.txt file and re-run the pip-compile command.