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Python Data Loading from to duckdb using dlt Library

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This guide provides instructions on how to load data from, a popular online platform for chess enthusiasts, into duckdb, a high-speed in-process analytical database, using the open-source Python library dlt. offers a variety of services, including online chess games, tournaments, and lessons. On the other hand, duckdb supports a feature-rich SQL dialect with deep client API integrations. The dlt library simplifies the process of data loading from various sources to multiple destinations. For more details about, please visit

dlt Key Features

  • Easy to get started: dlt is a Python library that is easy to use and understand. It is designed to be simple to use and easy to understand. Type pip install dlt and you are ready to go. Read more
  • Support for various destinations: dlt supports various destinations including DuckDB and MotherDuck. You can easily load data from different sources into these destinations. Read more about DuckDB and MotherDuck
  • Built-in data loading: dlt provides built-in data loading capabilities. It can load data from different sources like APIs, databases, and more. It also provides support for incremental loading, data deduplication, and more. Read more
  • Secure handling of secrets: dlt provides secure handling of secrets. You can easily manage and secure your sensitive information like API keys, tokens, and more. Read more
  • Integration with Streamlit: dlt integrates with Streamlit for data exploration. You can easily visualize and explore your data using Streamlit. Read more

Getting started with your pipeline locally

0. Prerequisites

dlt requires Python 3.8 or higher. Additionally, you need to have the pip package manager installed, and we recommend using a virtual environment to manage your dependencies. You can learn more about preparing your computer for dlt in our installation reference.

1. Install dlt

First you need to install the dlt library with the correct extras for DuckDB:

pip install "dlt[duckdb]"

The dlt cli has a useful command to get you started with any combination of source and destination. For this example, we want to load data from to DuckDB. You can run the following commands to create a starting point for loading data from to DuckDB:

# create a new directory
mkdir chess_pipeline
cd chess_pipeline
# initialize a new pipeline with your source and destination
dlt init chess duckdb
# install the required dependencies
pip install -r requirements.txt

The last command will install the required dependencies for your pipeline. The dependencies are listed in the requirements.txt:


You now have the following folder structure in your project:

├── .dlt/
│ ├── config.toml # configs for your pipeline
│ └── secrets.toml # secrets for your pipeline
├── chess/ # folder with source specific files
│ └── ...
├── # your main pipeline script
├── requirements.txt # dependencies for your pipeline
└── .gitignore # ignore files for git (not required)

2. Configuring your source and destination credentials

The dlt cli will have created a .dlt directory in your project folder. This directory contains a config.toml file and a secrets.toml file that you can use to configure your pipeline. The automatically created version of these files look like this:

generated config.toml

# put your configuration values here

log_level="WARNING" # the system log level of dlt
# use the dlthub_telemetry setting to enable/disable anonymous usage data reporting, see
dlthub_telemetry = true

config_int = 0 # please set me up!

generated secrets.toml

# put your secret values and credentials here. do not share this file and do not push it to github

secret_str = "secret_str" # please set me up!

[sources.chess.secret_dict] # please set me up!
key = "value"

2.1. Adjust the generated code to your usecase

Further help setting up your source and destinations
  • Read more about setting up the source in our docs.
  • Read more about setting up the DuckDB destination in our docs.

3. Running your pipeline for the first time

The dlt cli has also created a main pipeline script for you at, as well as a folder chess that contains additional python files for your source. These files are your local copies which you can modify to fit your needs. In some cases you may find that you only need to do small changes to your pipelines or add some configurations, in other cases these files can serve as a working starting point for your code, but will need to be adjusted to do what you need them to do.

The main pipeline script will look something like this:

import dlt
from chess import source

def load_players_games_example(start_month: str, end_month: str) -> None:
"""Constructs a pipeline that will load chess games of specific players for a range of months."""

# configure the pipeline: provide the destination and dataset name to which the data should go
pipeline = dlt.pipeline(
# create the data source by providing a list of players and start/end month in YYYY/MM format
data = source(
["magnuscarlsen", "vincentkeymer", "dommarajugukesh", "rpragchess"],
# load the "players_games" and "players_profiles" out of all the possible resources
info ="players_games", "players_profiles"))

def load_players_online_status() -> None:
"""Constructs a pipeline that will append online status of selected players"""

pipeline = dlt.pipeline(
data = source(["magnuscarlsen", "vincentkeymer", "dommarajugukesh", "rpragchess"])
info ="players_online_status"))

def load_players_games_incrementally() -> None:
"""Pipeline will not load the same game archive twice"""
# loads games for 11.2022
load_players_games_example("2022/11", "2022/11")
# second load skips games for 11.2022 but will load for 12.2022
load_players_games_example("2022/11", "2022/12")

if __name__ == "__main__":
# run our main example
load_players_games_example("2022/11", "2022/12")

Provided you have set up your credentials, you can run your pipeline like a regular python script with the following command:


4. Inspecting your load result

You can now inspect the state of your pipeline with the dlt cli:

dlt pipeline chess_pipeline info

You can also use streamlit to inspect the contents of your DuckDB destination for this:

# install streamlit
pip install streamlit
# run the streamlit app for your pipeline with the dlt cli:
dlt pipeline chess_pipeline show

5. Next steps to get your pipeline running in production

One of the beauties of dlt is, that we are just a plain Python library, so you can run your pipeline in any environment that supports Python >= 3.8. We have a couple of helpers and guides in our docs to get you there:

The Deploy section will show you how to deploy your pipeline to

  • Deploy with Github Actions: dlt can be deployed using Github Actions. This involves setting up a CI/CD pipeline that runs your dlt script on a schedule you specify.
  • Deploy with Airflow: You can also deploy dlt with Airflow, particularly using Google's managed Airflow environment, Google Composer. This involves creating an Airflow DAG for your pipeline script.
  • Deploy with Google Cloud Functions: dlt can be deployed with Google Cloud Functions. This involves writing a small wrapper around your dlt pipeline and deploying it as a Google Cloud Function.
  • Other Deployment Options: There are other ways to deploy dlt, including using serverless functions and notebooks.

The running in production section will teach you about:

  • Monitor your pipeline: dlt provides comprehensive tools to monitor the status and performance of your pipeline. You can learn more about how to monitor your pipeline here.
  • Set up alerts: With dlt, you can set up alerts to be notified about any significant changes or issues in your pipeline. Find out how to set up alerts here.
  • Set up tracing: Tracing allows you to track the execution of your pipeline and identify any potential bottlenecks or issues. Learn how to set up tracing with dlt here.

Available Sources and Resources

For this verified source the following sources and resources are available

Source chess

The source provides data on player profiles, online statuses, and historical game details.

Resource NameWrite DispositionDescription
players_gamesappendThis resource retrieves players' games that happened between a specified start and end month. It includes various details like accuracy, ratings, results, time control, tournament details, etc. for both the black and white players in each game.
players_online_statusappendThis resource checks the current online status of multiple chess players. It retrieves their username, status, last login date, and check time.
players_profilesreplaceThis resource retrieves player profiles for a list of player usernames. It includes details like the player's avatar, country, followers, streaming status, join date, last online time, league, location, name, player ID, status, title, URL, username, and verification status.

Additional pipeline guides

This demo works on codespaces. Codespaces is a development environment available for free to anyone with a Github account. You'll be asked to fork the demo repository and from there the README guides you with further steps.
The demo uses the Continue VSCode extension.

Off to codespaces!


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