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SysIdentPy is intended to be a community project, hence all contributions are welcome! There exist many possible use cases in System Identification field and we can not test all scenarios without your help! If you find any bugs or have suggestions, please report them on issue tracker on GitHub.

We welcome new contributors of all experience levels. The SysIdentPy community goals are to be helpful, welcoming, and effective.

Help others with issues in GitHub

You can see existing issues and try and help others, most of the times they are questions that you might already know the answer for.

Watch the GitHub repository

You can watch SysIdentPy in GitHub (clicking the "watch" button at the top right):

If you select "Watching" instead of "Releases only" you will receive notifications when someone creates a new issue.

Then you can try and help them solve those issues.


Documentation is as important as the library itself. English is not the primary language of the main authors, so if you find any typo or anything wrong do not hesitate to point out to us.

Create a Pull Request

You can contribute to the source code with Pull Requests, for example:

  • To fix a typo you found on the documentation.
  • To share an article, video, or podcast you created or found about SysIdentPy.
  • To propose new documentation sections.
  • To fix an existing issue/bug.
  • To add a new feature.

Development environment

These are some basic steps to help us with code:

  • Install and Setup Git on your computer.
  • Fork SysIdentPy.
  • Clone the fork on your local machine.
  • Create a new branch.
  • Make changes following the coding style of the project (or suggesting improvements).
  • Run the tests.
  • Write and/or adapt existing test if needed.
  • Add documentation if needed.
  • Commit.
  • Push to your fork.
  • Open a pull_request.


Clone the repository using

git clone

If you already cloned the repository and you know that you need to deep dive in the code, here are some guidelines to set up your environment.

Virtual environment with venv

You can create a virtual environment in a directory using Python's venv module or Conda:

$ python -m venv env
conda create -n env

That will create a directory ./env/ with the Python binaries and then you will be able to install packages for that isolated environment.

Activate the environment

If you created the environment using Python's venv module, activate it with:

source ./env/bin/activate

Or if you use Bash for Windows (e.g. Git Bash):

source ./env/Scripts/activate

If you created the environment using Conda, activate it with:

Or if you use Bash for Windows (e.g. Git Bash):

conda activate env

To check it worked, use:

$ which pip

$ Get-Command pip

$ where pip


If it shows the pip binary at env/bin/pip then it worked.


Every time you install a new package with pip under that environment, activate the environment again.


We use the pytest package for testing. The test functions are located in tests subdirectories at each folder inside SysIdentPy, which check the validity of the algorithms.


Install SysIdentPy with the dev and docs option to get all the necessary dependencies to run the tests

pip install "sysidentpy[dev, docs]"


First, make sure you set up your environment as described above, that will install all the requirements.

The documentation uses MkDocs and Material for MKDocs.

All the documentation is in Markdown format in the directory ./docs/.

Check the changes

During local development, you can serve the website locally and checks for any changes. This helps making sure that:

  • All of your modifications were applied.
  • The unmodified files are displaying as expected.
$ mkdocs serve

INFO     -  [13:25:00] Browser connected:

It will serve the documentation on

That way, you can keep editing the source files and see the changes live.


If any modification break the build, you have to serve the website again. Always check your console to make sure you are serving the website.

Run tests locally

Its always good to check if your implementations/modifications does not break any other part of the package. You can run the SysIdentPy tests locally using pytest in the respective folder to perform all the tests of the corresponding sub-packages.

Example of how to run the tests:

Open a terminal emulator of your choice and go to a subdirectory, e.g,


Just type pytest in the terminal emulator


and you get a result like:

========== test session starts ==========

platform linux -- Python 3.7.6, pytest-5.4.2, py-1.8.1, pluggy-0.13.1

rootdir: ~/sysidentpy

plugins: cov-2.8.1

collected 12 items

tests/ ............ [100%]

========== 12 passed in 2.45s ==================