wheel.py 文件源码

def cached_wheel(cache_dir, link, format_control, package_name):
    if not cache_dir:
        return link
    if not link:
        return link
    if link.is_wheel:
        return link
    if not link.is_artifact:
        return link
    if not package_name:
        return link
    canonical_name = canonicalize_name(package_name)
    formats = pip.index.fmt_ctl_formats(format_control, canonical_name)
    if "binary" not in formats:
        return link
    root = _cache_for_link(cache_dir, link)
    try:
        wheel_names = os.listdir(root)
    except OSError as e:
        if e.errno in (errno.ENOENT, errno.ENOTDIR):
            return link
        raise
    candidates = []
    for wheel_name in wheel_names:
        try:
            wheel = Wheel(wheel_name)
        except InvalidWheelFilename:
            continue
        if not wheel.supported():
            # Built for a different python/arch/etc
            continue
        candidates.append((wheel.support_index_min(), wheel_name))
    if not candidates:
        return link
    candidates.sort()
    path = os.path.join(root, candidates[0][1])
    return pip.index.Link(path_to_url(path))