Python 3 Byte String

[hashlash]

I think this tutorial needs an update to conform the newest version of pwntools.

One example is on the Utility Function tutorial page, section Packing and Unpacking Integers:

...

hex(unpack('AAAA'))
# '0x41414141'

...

On python3.5 with pwntools==4.2.0dev this will cause problem:

>>> from pwn import *
>>> unpack('AAAA')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.5/dist-packages/pwnlib/context/__init__.py", line 1461, in setter
    return function(*a, **kw)
  File "/usr/local/lib/python3.5/dist-packages/pwnlib/util/packing.py", line 221, in unpack
    data = bytearray(data)
TypeError: an integer is required

Looking from the commit history, it seems this function requires a byte string instead of normal string on Python 3. Since the last commit on this repo is a948b00 from Oct 10, 2018, I think it's time to have some update.

[heapcrash]

Giving this one to @Arusekk