util.py 文件源码

def ensure_extra_versions_supported(extra):
    # as this is an optional aid, don't fail if on old version of pip
    try:
        talisker_pkg = pkg_resources.get_distribution('talisker')
        extra_deps = (
            set(talisker_pkg.requires([extra])) - set(talisker_pkg.requires())
        )
        for requirement in extra_deps:
            pkg = pkg_resources.get_distribution(requirement.project_name)
            if pkg.version not in requirement.specifier:
                raise TaliskerVersionException(
                    '{} {} is not supported ({})'.format(
                        requirement.project_name, pkg.version, requirement))
    except Exception:
        logging.getLogger(__name__).debug(
            'skipping ensure_extra_versions_supported as exception occured')

    return True


# module level caches for global objects, means we can store all globals in
# a single place. This is useful when testing, as we can reset globals easily.