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quantopian /zipline

Zipline, a Pythonic Algorithmic Trading Library

11.6K Stars 3.4K Forks Last release: 15 days ago (1.4.0) Apache License 2.0 6.2K Commits 27 Releases

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Zipline is a Pythonic algorithmic trading library. It is an event-driven system for backtesting. Zipline is currently used in production as the backtesting and live-trading engine powering

Quantopian <https:></https:>

_ -- a free, community-centered, hosted platform for building and executing trading strategies. Quantopian also offers a

fully managed service for professionals <https:></https:>

_ that includes Zipline, Alphalens, Pyfolio, FactSet data, and more.

Join our Community! <https:></https:>


Documentation <https:></https:>


  • Want to Contribute? See our
    Development Guidelines <https:></https:>


  • Ease of Use: Zipline tries to get out of your way so that you can focus on algorithm development. See below for a code example.
  • "Batteries Included": many common statistics like moving average and linear regression can be readily accessed from within a user-written algorithm.
  • PyData Integration: Input of historical data and output of performance statistics are based on Pandas DataFrames to integrate nicely into the existing PyData ecosystem.
  • Statistics and Machine Learning Libraries: You can use libraries like matplotlib, scipy, statsmodels, and sklearn to support development, analysis, and visualization of state-of-the-art trading systems.


Zipline currently supports Python 2.7 and Python 3.5, and may be installed via either pip or conda.

Note: Installing Zipline is slightly more involved than the average Python package. See the full

Zipline Install Documentation

_ for detailed instructions.

For a development installation (used to develop Zipline itself), create and activate a virtualenv, then run the




See our

getting started tutorial <https:></https:>


The following code implements a simple dual moving average algorithm.

.. code:: python

from zipline.api import order\_target, record, symbol def initialize(context): context.i = 0 context.asset = symbol('AAPL') def handle\_data(context, data): # Skip first 300 days to get full windows context.i += 1 if context.i \< 300: return # Compute averages # data.history() has to be called with the same params # from above and returns a pandas dataframe. short\_mavg = data.history(context.asset, 'price', bar\_count=100, frequency="1d").mean() long\_mavg = data.history(context.asset, 'price', bar\_count=300, frequency="1d").mean() # Trading logic if short\_mavg \> long\_mavg: # order\_target orders as many shares as needed to # achieve the desired number of shares. order\_target(context.asset, 100) elif short\_mavg \< long\_mavg: order\_target(context.asset, 0) # Save values for later inspection record(AAPL=data.current(context.asset, 'price'), short\_mavg=short\_mavg, long\_mavg=long\_mavg)

You can then run this algorithm using the Zipline CLI. First, you must download some sample pricing and asset data:

.. code:: bash

$ zipline ingest $ zipline run -f dual\_moving\ --start 2014-1-1 --end 2018-1-1 -o dma.pickle --no-benchmark

This will download asset pricing data data sourced from Quandl, and stream it through the algorithm over the specified time range. Then, the resulting performance DataFrame is saved in


, which you can load and analyze from within Python.

You can find other examples in the




If you find a bug, feel free to

open an issue <https:></https:>

_ and fill out the issue template.


All contributions, bug reports, bug fixes, documentation improvements, enhancements, and ideas are welcome. Details on how to set up a development environment can be found in our

development guidelines <https:></https:>


If you are looking to start working with the Zipline codebase, navigate to the GitHub


tab and start looking through interesting issues. Sometimes there are issues labeled as

Beginner Friendly <https:></https:>

_ or

Help Wanted <https:></https:>


Feel free to ask questions on the

mailing list <https:></https:>

_ or on

Gitter <https:></https:>


.. note::

Please note that Zipline is not a community-led project. Zipline is maintained by the Quantopian engineering team, and we are quite small and often busy.

Because of this, we want to warn you that we may not attend to your pull request, issue, or direct mention in months, or even years. We hope you understand, and we hope that this note might help reduce any frustration or wasted time.

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.. _

Zipline Install Documentation


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