Hello,

In Python 3.6.0, % formatting fails to find formatting code after a null byte in bytes type.

Example:
    >>> "%s_\x00%s" % ("hello", "world")
    'hello_\x00world'
    >>> b"%s_\x00%s" % (b"hello", b"world")
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
    TypeError: not all arguments converted during bytes formatting

In contrast, the exact same code works as expected in Python 3.5:

    >>> "%s_\x00%s" % ("hello", "world")
    'hello_\x00world'
    >>> b"%s_\x00%s" % (b"hello", b"world")
    b'hello_\x00world'

I used Python 3.6.0 that I installed using pyenv 1.0.8 on Kubuntu 16.04 x86_64.