How to use the dulwich.objects.sha_to_hex function in dulwich

def _to_hexsha(self, sha):
        if len(sha) == 40:
            return sha
        elif len(sha) == 20:
            return sha_to_hex(sha)
        else:
            raise ValueError("Invalid sha %r" % (sha,))

def _to_hexsha(self, sha):
        if len(sha) == 40:
            return sha
        elif len(sha) == 20:
            return sha_to_hex(sha)
        else:
            raise ValueError("Invalid sha %r" % (sha,))

def _to_hexsha(self, sha):
        if len(sha) == 40:
            return sha
        elif len(sha) == 20:
            return sha_to_hex(sha)
        else:
            raise ValueError("Invalid sha %r" % (sha,))

def check_sha(self):
        stored = self.f.read(20)
        if stored != self.sha1.digest():
            raise ChecksumMismatch(self.sha1.hexdigest(), sha_to_hex(stored))

Args:
      f: File-like object to read from
    Returns:
      tuple with: device, inode, mode, uid, gid, size, sha, flags
    """
    beginoffset = f.tell()
    ctime = read_cache_time(f)
    mtime = read_cache_time(f)
    (dev, ino, mode, uid, gid, size, sha, flags, ) = \
        struct.unpack(">LLLLLL20sH", f.read(20 + 4 * 6 + 2))
    name = f.read((flags & 0x0fff))
    # Padding:
    real_size = ((f.tell() - beginoffset + 8) & ~7)
    f.read((beginoffset + real_size) - f.tell())
    return (name, ctime, mtime, dev, ino, mode, uid, gid, size,
            sha_to_hex(sha), flags & ~0x0fff)

def _to_hexsha(self, sha):
        if len(sha) == 40:
            return sha
        elif len(sha) == 20:
            return sha_to_hex(sha)
        else:
            raise ValueError("Invalid sha %r" % (sha,))