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Importing and querying CTD

Project Description

PyCTD is a Python package to access and query chemical–gene/protein interactions, chemical–disease and gene–disease relationships by data provided by the Comparative Toxicogenomics Database . Data are installed in a (local or remte) RDBMS enabling bioinformatic algorithms very fast response times to sophisticated queries and high flexibility by using SQLAlchemy database layer. PyCTD is developed by the Department of Bioinformatics at the Fraunhofer Institute for Algorithms and Scientific Computing SCAI For more in for information about CTD go to this section in the documentation.

This development is supported by following IMI projects:

Supported Databases

PyCTD uses SQLAlchemy to cover a wide spectrum of RDMSs (Relational database management system). For best performance MySQL or MariaDB is recommended. But if you have no possibility to install software on your system SQLite - which needs no further installation - also works. Following RDMSs are supported (by SQLAlchemy):

  1. Firebird
  2. Microsoft SQL Server
  3. MySQL / MariaDB
  4. Oracle
  5. PostgreSQL
  6. SQLite
  7. Sybase

Getting Started

This is a quick start tutorial for impatient.


PyCTD can be installed with pip.

pip install pyctd

If you fail because you have no rights to install use superuser (sudo on Linux before the commend) or …

pip install --user pyctd

If you want to make sure you are installing this under python3 use …

python3 -m pip install pyctd



If you want to use SQLite as your database system, because you …

  • have no possibility to use RDMSs like MySQL/MariaDB
  • just test pyctd, but don’t want to spend time in setting up a database

skip the next MySQL/MariaDB setup section. But in general we recommend MySQL or MariaDB as your RDBMS.

If you don’t know what all that means skip the section MySQL/MariaDB setup.

Don’t worry! You can always later change the configuration. For more information about changing database system later go to the subtitle Changing database configuration Changing database configuration in the documentation on readthedocs.

MySQL/MariaDB Setup

Log in MySQL as root user and create a new database, create a user, assign the rights and flush privileges.

GRANT ALL PRIVILEGES ON pyctd.* TO 'pyctd_user'@'%' IDENTIFIED BY 'pyctd_passwd';

Start a python shell and set the MySQL configuration. If you have not changed anything in the SQL statements …

import pyctd

If you have used you own settings, please adapt the following command to you requirements.

import pyctd
pyctd.set_mysql_connection(host='localhost', user='pyctd_user', passwd='pyctd_passwd', db='pyctd')


The updating process will download the files provided by the CTD team on the download page


Please note that download files needs 1,5Gb of disk space and the update takes ~2h (depending on your system)

import pyctd

Example Query

>>> query = pyctd.query()
>>> results = query.get_chem_gene_interaction_actions(gene_name='APP', interaction_action='meman%', limit=1)
>>> first_result = r
>>> r.chemical
>>> r.pubmed_ids
>>> r.chemical.drugbank_ids

More Information

See the installation documentation for more advanced instructions. Also, check the change log at CHANGELOG.rst.

CTD Tools and License (use of data)

CTD provides also many online query interfaces and tools to analyse data on their website.

Please be aware of the CTD license which allows the use of data only for research and educational purposes. Medical treatment decisions should not be made based on the information in CTD.

Any reproduction or use for commercial purpose is prohibited without the prior express written permission of the MDI Biological Laboratory and NC State University.

Release History

This version
History Node


History Node


Download Files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Filename, Size & Hash SHA256 Hash Help File Type Python Version Upload Date
(948.3 kB) Copy SHA256 Hash SHA256
Source None Jul 31, 2017

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