Pillow is a replacement for PIL that works as a drop-in replacement. Unlike PIL, it's actively maintained and easy to install. It's pretty great. There's only one problem, which is that users must first uninstall PIL before installing Pillow, as they share a namespace.
This makes it very hard for Python modules or products that need to run on a variety of configurations to easily depend on either PIL or Pillow without inevitably breaking something (perhaps in subtle ways). That makes it hard to safely transition.
This package aims to "solve" that by providing a single dependency that can
intelligently depend on either PIL or Pillow, based on what's already on the
system. Packages that still need to work if PIL is installed, but aim to
transition to Pillow, can simply depend on the
How it works
This package is provided as a source distribution with a simple setup script.
pillowfight is installed for the first time, its setup script will
run and start inspecting the system.
The setup script will look to see if PIL is already installed. If so, it will print a warning saying that PIL is deprecated and to install Pillow. It will then turn around and depend on PIL.
If PIL is not installed, it will instead depend on Pillow.
Simply replace your PIL dependency with
setup(name='MyPackage', version='1.0', install_requires=[ 'pillowfight' ] )
Why we wrote this
We use Django and Pillow for a product that sysadmins can install in their networks. There are a lot of configurations out there, and a lot of older systems already using PIL.
We've been trying to figure out the right strategy for getting new and existing users onto Pillow without breaking any installs. We don't have much control over their systems, so we knew we had to be clever.
A lot of projects out there seem to have modified their
setup.py files to
check what's on the system, but in practice, that doesn't work too well. When
building Python eggs, the
requires.txt files would be populated with
Pillow, and that just wasn't going to work.
So we wrote this as a way to have a stable dependency that could do the right thing. We hope others will find it useful.
Who's using it
We're using it for our code review product, Review Board.
If you're using it, let us know.