A Python client library for generating URLs with imgix. imgix is a high-performance distributed image processing service. More information can be found at http://www.imgix.com.

Installation

$ pip install imgix

Basic Usage

To begin creating imgix URLs programmatically, simply import the imgix library and create a URL builder. The URL builder can be reused to create URLs for any images on the domains it is provided.

import imgix

builder = imgix.UrlBuilder("demos.imgix.net")
print builder.create_url("/bridge.png", {'w': 100, 'h': 100})

# Prints out:
# http://demos.imgix.net/bridge.png?h=100&w=100

For HTTPS support, simply specify the HTTPS flag like so:

import imgix

builder = imgix.UrlBuilder("demos.imgix.net", use_https=True)
print builder.create_url("/bridge.png", {'w': 100, 'h': 100})

# Prints out:
# https://demos.imgix.net/bridge.png?h=100&w=100

Signed URLs

To produce a signed URL, you must enable secure URLs on your source and then provide your signature key to the URL builder.

import imgix

builder = imgix.UrlBuilder("demos.imgix.net", sign_key="test1234")
print builder.create_url("/bridge.png", {'w': 100, 'h': 100})

# Prints out:
# http://demos.imgix.net/bridge.png?h=100&w=100&s=7370d6e36bb2262e73b19578739af1af

Domain Sharded URLs

Domain sharding enables you to spread image requests across multiple domains. This allows you to bypass the requests-per-host limits of browsers. We recommend 2-3 domain shards maximum if you are going to use domain sharding.

In order to use domain sharding, you need to add multiple domains to your source. You then provide a list of these domains to a builder.

import imgix

builder = imgix.UrlBuilder([
    "demos-1.imgix.net",
    "demos-2.imgix.net",
    "demos-3.imgix.net",
])

print builder.create_url("/bridge.png", {'w': 100, 'h': 100})
print builder.create_url("/flower.png", {'w': 100, 'h': 100})

# Prints out:
# http://demos-2.imgix.net/bridge.png?h=100&w=100
# http://demos-3.imgix.net/flower.png?h=100&w=100

By default, shards are calculated using a checksum so that the image path always resolves to the same domain. This improves caching in the browser. However, you can supply a different strategy that cycles through domains instead. For example:

import imgix

builder = imgix.UrlBuilder([
    "demos-1.imgix.net",
    "demos-2.imgix.net",
    "demos-3.imgix.net",
], shard_strategy=imgix.SHARD_STRATEGY_CYCLE)

for i in xrange(4):
    print builder.create_url("/bridge.png", {'w': 100, 'h': 100})

# Prints out:
# http://demos-1.imgix.net/bridge.png?h=100&w=100
# http://demos-2.imgix.net/bridge.png?h=100&w=100
# http://demos-3.imgix.net/bridge.png?h=100&w=100
# http://demos-1.imgix.net/bridge.png?h=100&w=100

Usage with UTF-8

For usage with non-ASCII characters, please be sure to that your project’s source files specify UTF-8 encoding:

# -*- coding: utf-8 -*-

If you don't add this encoding, and you have an image with name for example 'tiburón.jpeg', you will get the following error trying to run your script:

SyntaxError: Non-ASCII character '***' in file test.py on line 6, but no encoding declared; see http://www.python.org/peps/pep-0263.html for details

Publishing to PyPI

To publish a new version of the package to PyPI, increment the version in imgix/init.py run the following:

pip install wheel
pip install twine
python setup.py sdist
python setup.py bdist_wheel --universal
twine upload dist/*

Running Tests

To run the tests and format the code, simply:

tox