resources.py 文件源码

def _get_pkg_resource(filename, package, prefix):
    """Query pkg_resources for the location of the filename."""
    requirement = pkg_resources.Requirement.parse(package)
    target = os.path.join(prefix, filename)
    try:
        return pkg_resources.resource_filename(requirement, target)
    except pkg_resources.DistributionNotFound:
        # It may be that the working set is not in sync (e.g. if sys.path was
        # manipulated). Try to reload it just in case.
        pkg_resources.working_set = pkg_resources.WorkingSet()
        try:
            return pkg_resources.resource_filename(requirement, target)
        except pkg_resources.DistributionNotFound:
            return None