Hi,
I'm sending a little module I use to force a particular version of
matplotlib and backend in my library.
This is imported in my package __init__.py to make sure the
environment is sane. It can also be imported in the beginning of the
app to set up a sane environment, which may be necessary if the app
uses matplotlib outside my library.
I don't think there is anything we can do within matplotlib to
address the version requirements.
The backend check could be a little easier if we modify matplotlib.use
() to be silent if the backend is already in use, or raise an error
if it isn't. ImportError seems appropriate, since use() is kind of
like an import. Calling switch_backend() is another option.
- Paul
# This program is public domain
"""
Configure plotter for plottools.
This must be imported first in __init__.py for plottools.
If your application uses matplotlib outside plottools, then
please do the following at the start of your application:
# Select matplotlib version and backend
import danse.common.plottools.config
Note that plottools requires particular versions of matplotlib
and a particular backend. As of this writing it is the WXAgg
backend for matplotlib>=0.98.
The plottools package uses pkg_resources if available to select
the correct version of matplotlib. If you need multiple matplotlib
versions in your path, be sure to use "easy_install -m" for all
of them. If a version is installed without "-m" that does not
meet the requirements, then pkg_resources.require() will fail,
even if you have installed a suitable version with "-m". In this
case you will need to fix up your site-packages directory,
probably by removing site-packages/matplotlib and the associated
egg file for that version, and reinstalling with "-m". You may
also need to edit site-packages/easy-install.pth.
"""
import sys
__all__ = []
plot_version="0.98"
plot_backend="WXAgg"
# Sort out matplotlib version
try:
import pkg_resources
pkg_resources.require("matplotlib>="+plot_version)
except ImportError:
import matplotlib
from distutils.version import StrictVersion as Version
if Version(matplotlib.__version__) < Version(plot_version):
raise ImportError("Matplotlib version must be %s or newer"%(plot_version,))
# Sort out matplotlib backend
import matplotlib
if 'matplotlib.backends' not in sys.modules:
# if no backend yet, be sure to use the correct one
matplotlib.use(plot_backend)
elif matplotlib.get_backend() != plot_backend:
# if a backend has already been selected, make sure it is the correct one.
raise ImportError("Matplotlib not using backend "+plot_backend)
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