Code completion result for source line:
self.append(decode_lo|ng(bytes))
(QueryType=COMPLETION, NameKind=PREFIX)
METHOD     decode_long(data)                          pickle

Documentation:

pickle
decode_long(data)

Decode a long from a two's complement little-endian binary string.

>>> decode_long('')
0L
>>> decode_long("\xff\x00")
255L
>>> decode_long("\xff\x7f")
32767L
>>> decode_long("\x00\xff")
-256L
>>> decode_long("\x00\x80")
-32768L
>>> decode_long("\x80")
-128L
>>> decode_long("\x7f")
127L