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reading, writing and sorting large files

Project description

streamio is a simple library of functions designed to read, write and sort large files using iterators so that the operations will successfully complete on systems with limited RAM. This library has been used extensively at Griffith University whilst developing the TerraNova Climate Change and Adaptation Visualization tool(s) and processing large volumes of data. streamio is written in Python and has extensive documentation and unit tests with 100% coverage.

See the API for a list of the available functions.

Latest PyPI version Number of PyPI downloads Build Status Requirements Status


Read a large text file iteratively:

from streamio import stream
f = stream("large_file.txt")

Read a large CSV file iteratively:

from streamio import jsonstream
f = stream("large_file.json")

Merge-sort a large JSON file with the key itemgetter("value"):

from operator import itemgetter
from streamio import mergesort
f = mergesort("large_file.json", key=itemgetter("value"))


streamio also comes with documentation and a full comprehensive unit test suite which require the following:

To build the docs:

To run the unit tests:


The simplest and recommended way to install streamio is with pip. You may install the latest stable release from PyPI with pip:

> pip install streamio

If you do not have pip, you may use easy_install:

> easy_install streamio

Alternatively, you may download the source package from the PyPI Page or the Downloads page on the Project Website; extract it and install using:

> python install

You can also install the latest-development version by using pip or easy_install:

> pip install streamio==dev


> easy_install streamio==dev

For further information see the streamio documentation.

Supported Platforms

  • Linux, FreeBSD, Mac OS X

  • Python 2.7

  • PyPy 2.2

Windows: We acknowledge that Windows exists and make reasonable efforts

to maintain compatibility. Unfortunately we cannot guarantee support at this time.


streamio 0.0.9 (2014-02-27)

  • Bumped py 1.4.19 -> 1.4.20

streamio 0.0.8 (2014-02-13)

  • Fixed Unicode support for csvstream adding unicodecsv as a new dependency.

streamio 0.0.7 (2014-01-29)

  • Forgot to include required README.rst and CHANGES.rst

streamio 0.0.6 (2014-01-29)

  • Don’t include fabfile and tests (for now) in the resulting egg

  • Make mergesort show progress optionally via progress=True

streamio 0.0.5 (2014-01-16)

  • Added encoding parameter support to *stream() function(s).

streamio 0.0.4 (2013-11-22)

  • Added function for compressing an iterable using zlib compression.

  • Loosended requirements on py and progress

streamio 0.0.3 (2013-11-21)

  • Fixed broken link to the API Docs.

streamio 0.0.2 (2013-11-21)

  • Added some examples

  • Fixed a few typos

streamio 0.0.1 (2013-11-21)

  • Initial Public Release

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