[Distutils] entry_points.txt survey

[Daniel Holth]

It looks like you can call pkg_resources.register_finder() with a
function that also yields distributions with a .dist-info directory
(though you would have to override the existing find_on_path). From
there I think pkg_resources.load_entry_point() is likely to work.

>From a survey of 16984 pypi source distributions (the newest for each
package surveyed), 5878 define entry_points.txt but 1399 of those are
empty. Some of the most popular sections are:

 (10, 'babel.extractors'),
 (10, 'lava_server.extensions'),
 (10, 'paste.composite_factory'),
 (10, 'turbogears.extensions'),
 (10, 'yafowil.plugin'),
 (10, 'zest.releaser.prereleaser.middle'),
 (11, 'chandler.parcels'),
 (11, 'rsl.register'),
 (12, 'hurry.resource.libraries'),
 (15, 'paste.global_paster_command'),
 (16, 'pyramid.scaffold'),
 (17, 'zc.buildout.uninstall'),
 (18, 'paste.server_runner'),
 (18, 'setuptools.installation'),
 (19, 'python.templating.engines'),
 (20, 'redsolutioncms'),
 (20, 'zope2.initialize'),
 (22, 'pytest11'),
 (23, 'setuptools.file_finders'),
 (26, 'paste.paster_command'),
 (30, 'nose.plugins'),
 (31, 'paste.filter_factory'),
 (31, 'zc.buildout.extension'),
 (35, 'toscawidgets.widgets'),
 (35, 'turbogears.widgets'),
 (37, 'tw2.widgets'),
 (47, 'paste.app_install'),
 (69, 'nose.plugins.0.10'),
 (73, 'distutils.commands'),
 (81, 'trytond.modules'),
 (82, 'gui_scripts'),
 (83, 'paste.filter_app_factory'),
 (94, 'fanstatic.libraries'),
 (96, 'trac.plugins'),
 (110, 'egg_info.writers'),
 (120, 'distutils.setup_keywords'),
 (144, 'paste.paster_create_template'),
 (190, 'paste.app_factory'),
 (354, 'zc.buildout'),
 (1004, 'z3c.autoinclude.plugin'),
 (1754, 'console_scripts')