Release Process


This page is intended for developers of zipline.

Updating the Release Notes

When we are ready to ship a new release of zipline, edit the Release Notes page. We will have been maintaining a whatsnew file while working on the release with the new version. First, find that file in: docs/source/whatsnew/<version>.txt. It will be the highest version number. Edit the release date field to be today’s date in the format:

<month> <day>, <year>

for example, November 6, 2015. Remove the active development warning from the whatsnew, since it will no longer be pending release. Update the title of the release from “Development” to “Release x.x.x” and update the underline of the title to match the title’s width.

If you are renaming the release at this point, you’ll need to git mv the file and also update releases.rst to reference the renamed file.

To build and view the docs locally, run:

$ cd docs
$ make html
$ {BROWSER} build/html/index.html

Updating the Python stub files

PyCharm and other linters and type checkers can use Python stub files for type hinting. For example, we generate stub files for the api namespace, since that namespace is populated at import time by decorators on TradingAlgorithm methods. Those functions are therefore hidden from static analysis tools, but we can generate static files to make them available. Under Python 3, run the following to generate any stub files:

$ python etc/


In order to make stub consumers aware of the classes referred to in the stub, the stub file should import those classes. However, since ... import * and ... import ... as ... in a stub file will export those imports, we import the names explicitly. For the stub for zipline.api, this is done in a header string in the script mentioned above. If new classes are added as parameters or return types of zipline.api functions, then new imports should be added to that header.

Updating the __version__

We use versioneer to manage the __version__ and version. This means that we pull this information from our version control’s tags to ensure that they stay in sync and to have very fine grained version strings for development installs.

To upgrade the version use the git tag command like:

$ git tag <major>.<minor>.<micro>
$ git push && git push --tags

This will push the the code and the tag information.

Next, click the “Draft a new release” button on the zipline releases page. For the new release, choose the tag you just pushed, and publish the release.

Uploading PyPI packages


To build the sdist (source distribution) run:

$ python sdist

from the zipline root. This will create a gzipped tarball that includes all the python, cython, and miscellaneous files needed to install zipline. To test that the source dist worked correctly, cd into an empty directory, create a new virtualenv and then run:

$ pip install <zipline-root>/dist/zipline-<major>.<minor>.<micro>.tar.gz
$ python -c 'import zipline;print(zipline.__version__)'

This should print the version we are expecting to release.


It is very important to both cd into a clean directory and make a clean virtualenv. Changing directories ensures that we have included all the needed files in the manifest. Using a clean virtualenv ensures that we have listed all the required packages.

Now that we have tested the package locally, it should be tested using the test PyPI server.

$ pip install twine
$ twine upload --repository-url dist/zipline-<version-number>.tar.gz

Twine will prompt you for a username and password, which you should have access to if you’re authorized to push Zipline releases.


If the package version has been taken: locally update your to override the version with a new number. Do not use the next version, just append a .<nano> section to the current version. PyPI prevents the same package version from appearing twice, so we need to work around this when debugging packaging problems on the test server.


Do not commit the temporary version change.

This will upload zipline to the pypi test server. To test installing from pypi, create a new virtualenv, cd into a clean directory and then run:

$ pip install --extra-index-url zipline
$ python -c 'import zipline;print(zipline.__version__)'

This should pull the package you just uploaded and then print the version number.

Now that we have tested locally and on PyPI test, it is time to upload to PyPI:

$ python sdist upload


Because zipline now supports multiple versions of numpy, we’re not building binary wheels, since they are not tagged with the version of numpy with which they were compiled.


To update, checkout the latest master and run:

python <zipline_root>/docs/

This will build the documentation, checkout a fresh copy of the gh-pages git branch, and copy the built docs into the zipline root.


The docs should always be built with Python 3. Many of our api functions are wrapped by preprocessing functions which accept *args and **kwargs. In Python 3, sphinx will respect the __wrapped__ attribute and display the correct arguments.

Now, using our browser of choice, view the index.html page and verify that the docs look correct.

Once we are happy, push the updated docs to the GitHub gh-pages branch.

$ git add .
$ git commit -m "DOC: update"
$ git push origin gh-pages will update in a few moments.

Uploading conda packages

Travis and AppVeyor build zipline conda packages for us. Once they have built and uploaded to the packages (and their dependencies) for the release commit to master, we should move those packages from the “ci” label to the “main” label. You can do this from the web interface. This is also a good time to remove all the old “ci” packages from anaconda.

Travis and AppVeyor only build and upload linux-64 and win-64 packages. We’ll need to build and upload osx-64 packages manually on an OSX machine.

To build the conda packages for zipline locally, run:

$ python etc/

If all of the builds succeed, then this will not print anything and exit with EXIT_SUCCESS. If there are build issues, we must address them and decide what to do.

Once all of the builds in the matrix pass, we can upload them to anaconda with:

$ python etc/ --upload

If you would like to test this command by uploading to a different user, this may be specified with the --user flag.

Next Commit

Push a new commit post-release that adds the whatsnew for the next release, which should be titled according to a micro version increment. If that next release turns out to be a major/minor version increment, the file can be renamed when that’s decided. You can use docs/source/whatsnew/skeleton.txt as a template for the new file.

Include the whatsnew file in docs/source/releases.rst. New releases should appear at the top. The syntax for this is:

.. include:: whatsnew/<version>.txt