Nobody sorts semantic versions correctly

compare_versions.py

#!/usr/bin/env python

import distutils.version
import pkg_resources
import random
import semantic_version
import sys 

versions = sys.argv[1:]

if not versions:
    versions = 'v1.0.0-alpha v1.0.0-alpha.1 v1.0.0-alpha.beta v1.0.0-beta v1.0.0-beta.2 v1.0.0-beta.11 v1.0.0-rc.1 v1.0 v1.0.0 v1.0.1 v1.0.2'.split()

random.shuffle(versions)

def semver_key(version):
    try:
        return semantic_version.Version(version.strip('v'))
    except ValueError:
        return semantic_version.Version(version.strip('v'), partial=True)

strings = sorted(versions)
distutils = sorted(versions, key=distutils.version.LooseVersion)
setuptools = sorted(versions, key=pkg_resources.parse_version)
semver = sorted(versions, key=semver_key)

fmt = '%-19s%-32s%-29s%s'
print fmt % ('str', 'distutils.version.LooseVersion', 'pkg_resources.parse_version', 'semantic_version.Version')
for lst in zip(strings, distutils, setuptools, semver):
    print fmt % lst

Compare with http://semver.org/:

1.0.0-alpha < 1.0.0-alpha.1 < 1.0.0-alpha.beta < 1.0.0-beta < 1.0.0-beta.2 < 1.0.0-beta.11 < 1.0.0-rc.1 < 1.0.0