A not negligible difference between Python 2 and Python 3

gistfile1.py

"""Programs not ported to Python 3 that they are using specific 
operations with strings could raise undesirable bugs"""

>>> title = "Open binary file with python 3"
>>> fd = open("/tmp/wut.png", "rb")
>>> b = fd.read()
>>> type(b)
<class 'bytes'>
>>> b[0] == "\x89"
False

>>> title = "Open binary file with python 2"
>>> fd = open("/tmp/wut.png", "rb")
>>> b = fd.read()
>>> type(b)
<type 'str'>
>>> b[0] == "\x89"
True