[New-bugs-announce] [issue29934] % formatting fails to find formatting code in bytes type after a null byte

[Mert Bora Alper]

New submission from Mert Bora Alper:

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.

----------
messages: 290724
nosy: boramalper
priority: normal
severity: normal
status: open
title: % formatting fails to find formatting code in bytes type after a null byte
type: behavior
versions: Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29934>
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