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Consider the following code:
$ cat bug.py
from array import array
class C(array):
 def __new__(cls):
 return array.__new__(cls, 'B', b'abc')
 def __index__(self):
 raise TypeError
x = C()
print(bytes(x))
It works under python 3.5:
$ python3.5 bug.py
b'abc'
but raises a TypeError under python 3.6:
$ python3.6 bug.py
Traceback (most recent call last):
 File "bug.py", line 8, in <module>
 print(bytes(x))
 File "bug.py", line 6, in __index__
 raise TypeError
TypeError
It looks like this was introduced in issue #27704.
(Ref: e/pyq#827)